diff --git a/README.md b/README.md
index 19a9343..303369a 100644
--- a/README.md
+++ b/README.md
@@ -18,15 +18,15 @@ mvn clean install
 ```
 
 ## Options
-| options               | description                                  | must | remark                                                    |
-|-----------------------|----------------------------------------------|------|-----------------------------------------------------------|
-| `-m, --model`         | The path of the model file or model text     | y    | Please wrap it with `""` and separate each line with `\|` |
-| `-p, --policy`        | The path of the policy file or policy text   | y    | Please wrap it with `""` and separate each line with `\|` |          
-| `-e, --enforce`       | Check permissions                            | n    | Please wrap it with `""`                                  |
-| `-ex, --enforceEx`    | Check permissions and get which policy it is | n    | Please wrap it with `""`                                  |
-| `-AF, --addFuntion`   | Add custom funtion                           | n    | Please wrap it with `""` and separate each line with `\|` |
-| `-ap, --addPolicy`    | Add a policy rule to the policy file         | n    | Please wrap it with `""`                                  |
-| `-rp, --removePolicy` | Remove a policy rule from the policy file    | n    | Please wrap it with `""`                                  |
+| options               | description                                                                                                                                                                 | must | remark                                                    |
+|-----------------------|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------|------|-----------------------------------------------------------|
+| `-m, --model`         | The path of the model file or model text                                                                                                                                    | y    | Please wrap it with `""` and separate each line with `\|` |
+| `-p, --policy`        | The path of the policy file or policy text                                                                                                                                  | y    | Please wrap it with `""` and separate each line with `\|` |          
+| `-e, --enforce`       | Check permissions                                                                                                                                                           | n    | Please wrap it with `""`                                  |
+| `-ex, --enforceEx`    | Check permissions and get which policy it is                                                                                                                                | n    | Please wrap it with `""`                                  |
+| `-AF, --addFuntion`   | Add custom funtion using text or function file.<br/>file format see [function.conf](https://github.com/jcasbin/casbin-java-cli/blob/master/examples/keymatch_function.conf) | n    | Please wrap it with `""` and separate each line with `\|` |
+| `-ap, --addPolicy`    | Add a policy rule to the policy file                                                                                                                                        | n    | Please wrap it with `""`                                  |
+| `-rp, --removePolicy` | Remove a policy rule from the policy file                                                                                                                                   | n    | Please wrap it with `""`                                  |
 
 ## Get started
 
diff --git a/examples/keymatch_function.conf b/examples/keymatch_function.conf
new file mode 100644
index 0000000..831b3f5
--- /dev/null
+++ b/examples/keymatch_function.conf
@@ -0,0 +1,25 @@
+[function_definition]
+public static boolean keyMatchTest(String key1, String key2) {
+    int i = key2.indexOf('*');
+    if (i == -1) {
+        return key1.equals(key2);
+    }
+
+    if (key1.length() > i) {
+        return key1.substring(0, i).equals(key2.substring(0, i));
+    }
+    return key1.equals(key2.substring(0, i));
+}
+
+[function_definition]
+public static boolean keyMatchTest2(String key1, String key2) {
+    int i = key2.indexOf('*');
+    if (i == -1) {
+        return key1.equals(key2);
+    }
+
+    if (key1.length() > i) {
+        return key1.substring(0, i).equals(key2.substring(0, i));
+    }
+    return key1.equals(key2.substring(0, i));
+}
diff --git a/src/main/java/org/casbin/Client.java b/src/main/java/org/casbin/Client.java
index a2dadf2..f5763ee 100644
--- a/src/main/java/org/casbin/Client.java
+++ b/src/main/java/org/casbin/Client.java
@@ -43,10 +43,12 @@ public static String run(String... args) {
             NewEnforcer enforcer = new NewEnforcer(model, policy);
 
             if(cmd.hasOption("AF")) {
-                String codes = cmd.getOptionValue("AF");
-                String methodName = Util.getMethodName(codes);
-                CustomFunction customFunction = DynamicClassGenerator.generateClass(methodName, codes);
-                enforcer.addFunction(methodName, customFunction);
+                List<String> codes = Util.parse(cmd.getOptionValue("AF"));
+                for (String code : codes) {
+                    String methodName = Util.getMethodName(code);
+                    CustomFunction customFunction = DynamicClassGenerator.generateClass(methodName, code);
+                    enforcer.addFunction(methodName, customFunction);
+                }
             }
             CommandExecutor commandExecutor = new CommandExecutor(enforcer, commandName, cmd.getArgs());
             Object o = commandExecutor.outputResult();
@@ -110,7 +112,7 @@ private static void printHelpMessage() {
                 "    Options:\n" +
                 "      -m, --model <model>          The path of the model file or model text. Please wrap it with \"\" and separate each line with \"|\"\n" +
                 "      -p, --policy <policy>        The path of the policy file or policy text. Please wrap it with \"\" and separate each line with \"|\"\n" +
-                "      -AF, --addFunction <functionDefinition>       Add custom function. Please wrap it with \"\" and separate each line with \"|\"\n" +
+                "      -AF, --addFunction <functionDefinition>       The path of the function file or function text. Please wrap it with \"\" and separate each line with \"|\"\n" +
                 "\n" +
                 "    args:\n" +
                 "      Parameters required for the method\n" +
diff --git a/src/main/java/org/casbin/util/Util.java b/src/main/java/org/casbin/util/Util.java
index 56f0ce4..e1413ea 100644
--- a/src/main/java/org/casbin/util/Util.java
+++ b/src/main/java/org/casbin/util/Util.java
@@ -1,5 +1,9 @@
 package org.casbin.util;
 
+import java.io.File;
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
@@ -26,4 +30,30 @@ public static int getArgsNum(String methodCodes) {
         }
         return 0;
     }
+
+    /**
+     * Parse the input string to get the function definitions List
+     * @param input
+     * @return List of function definitions
+     */
+    public static List<String> parse(String input) throws IOException {
+        if (input == null || input.trim().isEmpty()) {
+            throw new IllegalArgumentException("Input cannot be null or empty");
+        }
+        List<String> codes = new ArrayList<>();
+
+        // Check if input is an existing file
+        File file = new File(input);
+        if (file.exists() && file.isFile()) {
+            String content =  new String(Files.readAllBytes(file.toPath()), StandardCharsets.UTF_8);
+
+            String[] lines = content.split("\\[function_definition\\]");
+            for (int i = 1; i < lines.length; i++) {
+                codes.add(lines[i].trim());
+            }
+        } else {
+            codes.add(input);
+        }
+        return codes;
+    }
 }
diff --git a/src/test/java/org/casbin/ClientTest.java b/src/test/java/org/casbin/ClientTest.java
index b3df73e..a9c2b1b 100644
--- a/src/test/java/org/casbin/ClientTest.java
+++ b/src/test/java/org/casbin/ClientTest.java
@@ -116,6 +116,41 @@ public void testCustomFunction() throws ParseException {
         assertEquals(Client.run(new String[]{"enforce", "-m", model, "-p", "examples/keymatch_policy.csv", "-AF", func,   "cathy", "/cathy_data", "POST"}), "{\"allow\":true,\"explain\":null}");
         assertEquals(Client.run(new String[]{"enforce", "-m", model, "-p", "examples/keymatch_policy.csv", "-AF", func,   "cathy", "/cathy_data", "DELETE"}), "{\"allow\":false,\"explain\":null}");
 
+        // test add Function using file
+        String methodName2 = "keyMatchTest2";
+        String model2 = "[request_definition]\n" +
+                "r = sub, obj, act\n" +
+                "\n" +
+                "[policy_definition]\n" +
+                "p = sub, obj, act\n" +
+                "\n" +
+                "[policy_effect]\n" +
+                "e = some(where (p.eft == allow))\n" +
+                "\n" +
+                "[matchers]\n" +
+                "m = r.sub == p.sub && " + methodName + "(r.obj, p.obj) && " + methodName2 + "(r.obj, p.obj)" + "&& regexMatch(r.act, p.act)\n";
+
+        assertEquals(Client.run(new String[]{"enforce", "-m", model2, "-p", "examples/keymatch_policy.csv", "-AF", "examples/keymatch_function.conf", "alice", "/alice_data/resource1", "GET"}), "{\"allow\":true,\"explain\":null}");
+        assertEquals(Client.run(new String[]{"enforce", "-m", model2, "-p", "examples/keymatch_policy.csv", "-AF", "examples/keymatch_function.conf",   "alice", "/alice_data/resource1", "POST"}), "{\"allow\":true,\"explain\":null}");
+        assertEquals(Client.run(new String[]{"enforce", "-m", model2, "-p", "examples/keymatch_policy.csv", "-AF", "examples/keymatch_function.conf",   "alice", "/alice_data/resource2", "GET"}), "{\"allow\":true,\"explain\":null}");
+        assertEquals(Client.run(new String[]{"enforce", "-m", model2, "-p", "examples/keymatch_policy.csv", "-AF", "examples/keymatch_function.conf",   "alice", "/alice_data/resource2", "POST"}), "{\"allow\":false,\"explain\":null}");
+        assertEquals(Client.run(new String[]{"enforce", "-m", model2, "-p", "examples/keymatch_policy.csv", "-AF", "examples/keymatch_function.conf",   "alice", "/bob_data/resource1", "GET"}), "{\"allow\":false,\"explain\":null}");
+        assertEquals(Client.run(new String[]{"enforce", "-m", model2, "-p", "examples/keymatch_policy.csv", "-AF", "examples/keymatch_function.conf",   "alice", "/bob_data/resource1", "POST"}), "{\"allow\":false,\"explain\":null}");
+        assertEquals(Client.run(new String[]{"enforce", "-m", model2, "-p", "examples/keymatch_policy.csv", "-AF", "examples/keymatch_function.conf",   "alice", "/bob_data/resource2", "GET"}), "{\"allow\":false,\"explain\":null}");
+        assertEquals(Client.run(new String[]{"enforce", "-m", model2, "-p", "examples/keymatch_policy.csv", "-AF", "examples/keymatch_function.conf",   "alice", "/bob_data/resource2", "POST"}), "{\"allow\":false,\"explain\":null}");
+
+        assertEquals(Client.run(new String[]{"enforce", "-m", model2, "-p", "examples/keymatch_policy.csv", "-AF", "examples/keymatch_function.conf",   "bob", "/alice_data/resource1", "GET"}), "{\"allow\":false,\"explain\":null}");
+        assertEquals(Client.run(new String[]{"enforce", "-m", model2, "-p", "examples/keymatch_policy.csv", "-AF", "examples/keymatch_function.conf",   "bob", "/alice_data/resource1", "POST"}), "{\"allow\":false,\"explain\":null}");
+        assertEquals(Client.run(new String[]{"enforce", "-m", model2, "-p", "examples/keymatch_policy.csv", "-AF", "examples/keymatch_function.conf",   "bob", "/alice_data/resource2", "GET"}), "{\"allow\":true,\"explain\":null}");
+        assertEquals(Client.run(new String[]{"enforce", "-m", model2, "-p", "examples/keymatch_policy.csv", "-AF", "examples/keymatch_function.conf",   "bob", "/alice_data/resource2", "POST"}), "{\"allow\":false,\"explain\":null}");
+        assertEquals(Client.run(new String[]{"enforce", "-m", model2, "-p", "examples/keymatch_policy.csv", "-AF", "examples/keymatch_function.conf",   "bob", "/bob_data/resource1", "GET"}), "{\"allow\":false,\"explain\":null}");
+        assertEquals(Client.run(new String[]{"enforce", "-m", model2, "-p", "examples/keymatch_policy.csv", "-AF", "examples/keymatch_function.conf",   "bob", "/bob_data/resource1", "POST"}), "{\"allow\":true,\"explain\":null}");
+        assertEquals(Client.run(new String[]{"enforce", "-m", model2, "-p", "examples/keymatch_policy.csv", "-AF", "examples/keymatch_function.conf",   "bob", "/bob_data/resource2", "GET"}), "{\"allow\":false,\"explain\":null}");
+        assertEquals(Client.run(new String[]{"enforce", "-m", model2, "-p", "examples/keymatch_policy.csv", "-AF", "examples/keymatch_function.conf",   "bob", "/bob_data/resource2", "POST"}), "{\"allow\":true,\"explain\":null}");
+
+        assertEquals(Client.run(new String[]{"enforce", "-m", model2, "-p", "examples/keymatch_policy.csv", "-AF", "examples/keymatch_function.conf",   "cathy", "/cathy_data", "GET"}), "{\"allow\":true,\"explain\":null}");
+        assertEquals(Client.run(new String[]{"enforce", "-m", model2, "-p", "examples/keymatch_policy.csv", "-AF", "examples/keymatch_function.conf",   "cathy", "/cathy_data", "POST"}), "{\"allow\":true,\"explain\":null}");
+        assertEquals(Client.run(new String[]{"enforce", "-m", model2, "-p", "examples/keymatch_policy.csv", "-AF", "examples/keymatch_function.conf",   "cathy", "/cathy_data", "DELETE"}), "{\"allow\":false,\"explain\":null}");
     }
 
     @Test