diff --git a/polyjuice-tests/src/helper.rs b/polyjuice-tests/src/helper.rs
index 25ac536a..a794204b 100644
--- a/polyjuice-tests/src/helper.rs
+++ b/polyjuice-tests/src/helper.rs
@@ -287,10 +287,10 @@ pub fn new_contract_account_script_with_nonce(from_addr: &[u8; 20], from_nonce:
     let mut stream = RlpStream::new_list(2);
     stream.append(&from_addr.to_vec());
     stream.append(&from_nonce);
-    println!(
-        "rlp data of (eoa_address + nonce): {}",
-        hex::encode(stream.as_raw())
-    );
+    // println!(
+    //     "rlp data of (eoa_address + nonce): {}",
+    //     hex::encode(stream.as_raw())
+    // );
     let data_hash = tiny_keccak::keccak256(stream.as_raw());
 
     let mut new_script_args = vec![0u8; 32 + 4 + 20];
@@ -799,3 +799,22 @@ pub(crate) fn eth_address_regiser(
         None,
     )
 }
+
+pub(crate) fn print_gas_used(operation: &str, logs: &Vec<LogItem>) {
+    let mut gas_used: Option<u64> = None;
+    for log in logs {
+        gas_used = match parse_log(log) {
+            crate::helper::Log::PolyjuiceSystem {
+                gas_used,
+                cumulative_gas_used: _,
+                created_address: _,
+                status_code: _,
+            } => Some(gas_used),
+            _ => None
+        };
+        if gas_used.is_some() {
+            break;
+        }
+    }
+    println!("{}: {} gas used", operation, gas_used.unwrap());
+}
diff --git a/polyjuice-tests/src/test_cases/address.rs b/polyjuice-tests/src/test_cases/address.rs
index ff394f0d..81c7d4c8 100644
--- a/polyjuice-tests/src/test_cases/address.rs
+++ b/polyjuice-tests/src/test_cases/address.rs
@@ -69,6 +69,7 @@ fn test_get_contract_code() {
         )
         .expect("call createMemoryArray function");
     let mut expect_result = [0u8; 32];
+    #[allow(clippy::needless_range_loop)]
     for i in 0..32 {
         expect_result[i] = i as u8;
     }
diff --git a/polyjuice-tests/src/test_cases/erc20.rs b/polyjuice-tests/src/test_cases/erc20.rs
index 9b06fd7f..3466964a 100644
--- a/polyjuice-tests/src/test_cases/erc20.rs
+++ b/polyjuice-tests/src/test_cases/erc20.rs
@@ -3,7 +3,7 @@
 
 use crate::helper::{
     self, deploy, eth_addr_to_ethabi_addr, new_block_info, setup, MockContractInfo,
-    PolyjuiceArgsBuilder, CREATOR_ACCOUNT_ID, L2TX_MAX_CYCLES,
+    PolyjuiceArgsBuilder, CREATOR_ACCOUNT_ID, L2TX_MAX_CYCLES, print_gas_used,
 };
 use gw_common::state::State;
 use gw_generator::traits::StateExt;
@@ -43,6 +43,7 @@ fn test_erc20() {
         block_producer_id.clone(),
         1,
     );
+    print_gas_used("Deploy ERC20 contract: ", &run_result.logs);
     // [Deploy ERC20] used cycles: 1018075 < 1020K
     helper::check_cycles("Deploy ERC20", run_result.used_cycles, 1_400_000);
 
@@ -158,6 +159,8 @@ fn test_erc20() {
                 None,
             )
             .expect(operation);
+        print_gas_used(&format!("ERC20 {}: ", operation), &run_result.logs);
+
         // [ERC20 contract method_x] used cycles: 942107 < 960K
         helper::check_cycles("ERC20 contract method_x", run_result.used_cycles, 1_400_000);
         state.apply_run_result(&run_result).expect("update state");
diff --git a/polyjuice-tests/src/test_cases/receive_ether.rs b/polyjuice-tests/src/test_cases/receive_ether.rs
index 67ea2d13..c3babef9 100644
--- a/polyjuice-tests/src/test_cases/receive_ether.rs
+++ b/polyjuice-tests/src/test_cases/receive_ether.rs
@@ -11,7 +11,7 @@ use gw_types::{
 
 use crate::helper::{
     check_cycles, create_block_producer, deploy, eth_addr_to_ethabi_addr, new_block_info,
-    parse_log, setup, MockContractInfo, PolyjuiceArgsBuilder, CREATOR_ACCOUNT_ID, L2TX_MAX_CYCLES,
+    parse_log, setup, MockContractInfo, PolyjuiceArgsBuilder, CREATOR_ACCOUNT_ID, L2TX_MAX_CYCLES, print_gas_used,
 };
 
 const INIT_CODE: &str = include_str!("./evm-contracts/EtherReceiverMock.bin");
@@ -46,7 +46,7 @@ fn receive_ether_test() -> anyhow::Result<()> {
         .get_account_id_by_script_hash(&contract_account.script_hash)?
         .unwrap();
 
-    //call receive()
+    // call receive()
     let block_info = new_block_info(block_producer, 1, 0);
     let args = PolyjuiceArgsBuilder::default()
         .gas_limit(2100)
@@ -73,8 +73,8 @@ fn receive_ether_test() -> anyhow::Result<()> {
         .expect("Call receive()");
     check_cycles("receive()", run_result.used_cycles, 710_100);
     assert!(run_result.return_data.is_empty());
-    let log = parse_log(&run_result.logs[1]);
-    let receive_data = match log {
+
+    let receive_data = match parse_log(&run_result.logs[1]) {
         crate::helper::Log::PolyjuiceUser {
             address: _,
             data,
@@ -85,6 +85,9 @@ fn receive_ether_test() -> anyhow::Result<()> {
     let mut expect = [7u8; 8];
     expect[1..].copy_from_slice(b"receive");
     assert_eq!(receive_data, Some(expect.to_vec()));
+
+    print_gas_used("A simplest receive() call: ", &run_result.logs);
+
     state.apply_run_result(&run_result).expect("update state");
     Ok(())
 }
@@ -99,7 +102,7 @@ fn without_receive_fallback_test() -> anyhow::Result<()> {
         crate::helper::create_eth_eoa_account(&mut state, &from_eth_address, 200000000u64.into());
 
     // Deploy SimpleTrasfer Contract
-    let _run_result = deploy(
+    let run_result = deploy(
         &generator,
         &store,
         &mut state,
@@ -111,6 +114,8 @@ fn without_receive_fallback_test() -> anyhow::Result<()> {
         block_producer.clone(),
         0,
     );
+    print_gas_used("Deploy SimpleTrasfer Contract: ", &run_result.logs);
+
     let st_contract_account = MockContractInfo::create(&from_eth_address, 0);
     let st_account_id = state
         .get_account_id_by_script_hash(&st_contract_account.script_hash)?
@@ -129,12 +134,14 @@ fn without_receive_fallback_test() -> anyhow::Result<()> {
         block_producer.clone(),
         0,
     );
+    print_gas_used("Deploy RejectedSimpleStorage Contract: ", &run_result.logs);
+
     let ss_contract_account = MockContractInfo::create(&from_eth_address, 1);
     let _ss_account_id = state
         .get_account_id_by_script_hash(&ss_contract_account.script_hash)?
         .unwrap();
 
-    // SimpleTransfer.transferToSimpleStorage1();
+    // SimpleTransfer.transferToSimpleStorage1() -> target_addr.transfer(1 wei);
     let block_info = new_block_info(block_producer, 1, 1);
 
     let input = hex::decode(format!(
@@ -171,5 +178,9 @@ fn without_receive_fallback_test() -> anyhow::Result<()> {
         TransactionError::InvalidExitCode(2)
     );
 
+    // TODO: read the log of a failed transaction
+    // print!("SimpleTransfer.transferToSimpleStorage1(): ");
+    // print_gas_used(&run_result.logs[0]);
+
     Ok(())
 }
diff --git a/polyjuice-tests/src/test_cases/sudt_erc20_proxy.rs b/polyjuice-tests/src/test_cases/sudt_erc20_proxy.rs
index ec6c53d4..def574df 100644
--- a/polyjuice-tests/src/test_cases/sudt_erc20_proxy.rs
+++ b/polyjuice-tests/src/test_cases/sudt_erc20_proxy.rs
@@ -5,7 +5,7 @@ use crate::helper::{
     self, build_eth_l2_script, build_l2_sudt_script, deploy, eth_addr_to_ethabi_addr,
     new_block_info, new_contract_account_script, setup, PolyjuiceArgsBuilder, CKB_SUDT_ACCOUNT_ID,
     CREATOR_ACCOUNT_ID, FATAL_PRECOMPILED_CONTRACTS, L2TX_MAX_CYCLES,
-    SUDT_ERC20_PROXY_USER_DEFINED_DECIMALS_CODE,
+    SUDT_ERC20_PROXY_USER_DEFINED_DECIMALS_CODE, print_gas_used,
 };
 use gw_common::builtins::ETH_REGISTRY_ACCOUNT_ID;
 use gw_common::registry_address::RegistryAddress;
@@ -45,7 +45,7 @@ fn test_sudt_erc20_proxy_inner(
     // => 0x00000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000e0000000000000000000000000000000000000000000000000000000024cb016ea00000000000000000000000000000000000000000000000000000000000000010000000000000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000000000000000000e65726332305f646563696d616c7300000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000034445430000000000000000000000000000000000000000000000000000000000
     let args = format!("00000000000000000000000000000000000000000000000000000000000000a000000000000000000000000000000000000000000000000000000000000000e0000000000000000000000000000000000000000000000000000000024cb016ea00000000000000000000000000000000000000000000000000000000000000{:02x}00000000000000000000000000000000000000000000000000000000000000{:02x}000000000000000000000000000000000000000000000000000000000000000e65726332305f646563696d616c7300000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000034445430000000000000000000000000000000000000000000000000000000000", new_sudt_id, decimals);
     let init_code = format!("{}{}", SUDT_ERC20_PROXY_USER_DEFINED_DECIMALS_CODE, args);
-    let _run_result = deploy(
+    let run_result = deploy(
         generator,
         store,
         state,
@@ -58,10 +58,11 @@ fn test_sudt_erc20_proxy_inner(
         1,
     );
     print!("SudtERC20Proxy_UserDefinedDecimals.ContractCode.hex: 0x");
-    for byte in _run_result.return_data {
+    for byte in run_result.return_data {
         print!("{:02x}", byte);
     }
     println!();
+    print_gas_used("Deploy SUDT_ERC20_PROXY contract: ", &run_result.logs);
 
     let contract_account_script =
         new_contract_account_script(state, from_id1, &from_eth_address1, false);
@@ -306,6 +307,8 @@ fn test_sudt_erc20_proxy_inner(
             L2TX_MAX_CYCLES,
             None,
         )?;
+        print_gas_used(&format!("SudtERC20Proxy {}: ", action), &run_result.logs);
+
         println!(
             "[execute_transaction] {} {}ms",
             action,