diff --git a/src/test.ts b/src/test.ts
index 955aee1..a58d929 100644
--- a/src/test.ts
+++ b/src/test.ts
@@ -106,6 +106,15 @@ var uriDataSet = [
       pathSegments: ['watch']
     }
   ],
+  [
+    './a/b/c/watch',
+    {
+      schema: UriBuilder.relative,
+      host: '.',
+      port: undefined,
+      pathSegments: ['a', 'b', 'c', 'watch']
+    }
+  ],
   [
     'https://www.youtube.com/watch?v=TlzfSfc_ymI&%E4%B8%AD%E6%96%87=%E4%B8%AD%E6%96%87',
     {
@@ -200,3 +209,10 @@ console.assert(
   emptyBuilder.toString() === 'http://guest@example/home/index#top'
 );
 console.log(emptyBuilder.toString());
+
+hr();
+console.info('Relative Test');
+const relativeBuilder = UriBuilder.parse('./home/exam?id=0');
+relativeBuilder.query.id = 1;
+console.assert(relativeBuilder.toString() === './home/exam?id=1');
+console.log(relativeBuilder.toString());
diff --git a/src/uriBuilder.ts b/src/uriBuilder.ts
index 060bf6c..095fd7d 100644
--- a/src/uriBuilder.ts
+++ b/src/uriBuilder.ts
@@ -22,6 +22,7 @@ export interface IUriModel {
 }
 
 export class UriBuilder implements IUriModel {
+  public static relative = 'relative';
   public schema: string;
 
   private _authority: IUriAuthority;
@@ -63,7 +64,10 @@ export class UriBuilder implements IUriModel {
 
   public static parse(uri: string): UriBuilder {
     if (!this.isUriFormat(uri)) {
-      throw new Error('URI Format ERROR');
+      uri = `${UriBuilder.relative}://${uri}`;
+      if (!this.isUriFormat(uri)) {
+        throw new Error('URI Format ERROR');
+      }
     }
 
     const result = new UriBuilder();
@@ -126,8 +130,17 @@ export class UriBuilder implements IUriModel {
     this._authority.password = password;
   }
 
+  public isRelative(): boolean {
+    return this.schema === UriBuilder.relative;
+  }
+
   public toString(): string {
     let result = `${this.schema}://`;
+
+    if (this.schema === UriBuilder.relative) {
+      result = '';
+    }
+
     if (this.authority && this.authority.user) {
       result += this.authority.user;
       if (this.authority.password) {
diff --git a/src/uriSchemaPortList.ts b/src/uriSchemaPortList.ts
index 7ad3350..82e7ccd 100644
--- a/src/uriSchemaPortList.ts
+++ b/src/uriSchemaPortList.ts
@@ -1,6 +1,7 @@
 export class UriSchemaPortList {
   static http = 80;
   static https = 80;
+  static relative = undefined;
 
   public static getPort(schema: string): number {
     return this[schema.toLowerCase()];