diff --git a/src/Contract.php b/src/Contract.php
index 4b8b933..ddc9e45 100644
--- a/src/Contract.php
+++ b/src/Contract.php
@@ -507,4 +507,54 @@ class Contract
             });
         }
     }
+
+    /**
+     * getData
+     * Get the function method call data.
+     * With this function, you can send signed contract function transaction.
+     * 1. Get the funtion data with params.
+     * 2. Sign the data with user private key.
+     * 3. Call sendRawTransaction.
+     * 
+     * @param mixed
+     * @return void
+     */
+    public function getData()
+    {
+        if (isset($this->functions) || isset($this->constructor)) {
+            $arguments = func_get_args();
+            $functionData = '';
+
+            if (empty($this->toAddress) && !empty($this->bytecode)) {
+                $constructor = $this->constructor;
+
+                if (count($arguments) < count($constructor['inputs'])) {
+                    throw new InvalidArgumentException('Please make sure you have put all constructor params and callback.');
+                }
+                if (!isset($this->bytecode)) {
+                    throw new \InvalidArgumentException('Please call bytecode($bytecode) before getData().');
+                }
+                $params = array_splice($arguments, 0, count($constructor['inputs']));
+                $data = $this->ethabi->encodeParameters($constructor, $params);
+                $functionData = $this->bytecode . Utils::stripZero($data);
+            } else {
+                $method = array_splice($arguments, 0, 1)[0];
+
+                if (!is_string($method) && !isset($this->functions[$method])) {
+                    throw new InvalidArgumentException('Please make sure the method is existed.');
+                }
+                $function = $this->functions[$method];
+
+                if (count($arguments) < count($function['inputs'])) {
+                    throw new InvalidArgumentException('Please make sure you have put all function params and callback.');
+                }
+                $params = array_splice($arguments, 0, count($function['inputs']));
+                $data = $this->ethabi->encodeParameters($function, $params);
+                $functionName = Utils::jsonMethodToString($function);
+                $functionSignature = $this->ethabi->encodeFunctionSignature($functionName);
+                $functionData = Utils::stripZero($functionSignature) . Utils::stripZero($data);
+            }
+            return $functionData;
+        }
+    }
 }
\ No newline at end of file
diff --git a/test/unit/ContractTest.php b/test/unit/ContractTest.php
index b3f0d91..8984824 100644
--- a/test/unit/ContractTest.php
+++ b/test/unit/ContractTest.php
@@ -334,8 +334,7 @@ class ContractTest extends TestCase
             'gas' => '0x200b20'
         ], function ($err, $result) use ($contract) {
             if ($err !== null) {
-                // infura api gg
-                return $this->assertTrue($err !== null);
+                return $this->fail($err->getMessage());
             }
             if ($result) {
                 echo "\nTransaction has made:) id: " . $result . "\n";
@@ -379,8 +378,7 @@ class ContractTest extends TestCase
             'gas' => '0x200b20'
         ], function ($err, $result) use ($contract) {
             if ($err !== null) {
-                // infura api gg
-                return $this->assertTrue($err !== null);
+                return $this->fail($err->getMessage());
             }
             if ($result) {
                 echo "\nTransaction has made:) id: " . $result . "\n";
@@ -407,8 +405,7 @@ class ContractTest extends TestCase
             'gas' => '0x200b20'
         ], function ($err, $result) use ($contract, $fromAccount, $toAccount) {
             if ($err !== null) {
-                // infura api gg
-                return $this->assertTrue($err !== null);
+                return $this->fail($err->getMessage());
             }
             if ($result) {
                 echo "\nTransaction has made:) id: " . $result . "\n";
@@ -457,8 +454,7 @@ class ContractTest extends TestCase
             'gas' => '0x200b20'
         ], function ($err, $result) use ($contract) {
             if ($err !== null) {
-                // infura api gg
-                return $this->assertTrue($err !== null);
+                return $this->fail($err->getMessage());
             }
             if ($result) {
                 echo "\nTransaction has made:) id: " . $result . "\n";
@@ -484,8 +480,7 @@ class ContractTest extends TestCase
             'from' => $fromAccount
         ], function ($err, $result) use ($contract) {
             if ($err !== null) {
-                // infura api gg
-                return $this->assertTrue($err !== null);
+                return $this->fail($err->getMessage());
             }
             if (isset($result)) {
                 // $bn = Utils::toBn($result);
@@ -519,8 +514,7 @@ class ContractTest extends TestCase
             'gas' => '0x200b20'
         ], function ($err, $result) use ($contract) {
             if ($err !== null) {
-                // infura api gg
-                return $this->assertTrue($err !== null);
+                return $this->fail($err->getMessage());
             }
             if ($result) {
                 echo "\nTransaction has made:) id: " . $result . "\n";
@@ -544,8 +538,7 @@ class ContractTest extends TestCase
             'gas' => '0x200b20'
         ], function ($err, $result) use ($contract) {
             if ($err !== null) {
-                // infura api gg
-                return $this->assertTrue($err !== null);
+                return $this->fail($err->getMessage());
             }
             if (isset($result)) {
                 echo "\nEstimate gas: " . $result->toString() . "\n";
@@ -569,4 +562,60 @@ class ContractTest extends TestCase
             }
         });
     }
+
+    /**
+     * testGetData
+     * 
+     * @return void
+     */
+    public function testGetData()
+    {
+        $contract = $this->contract;
+
+        if (!isset($this->accounts[0])) {
+            $fromAccount = '0x407d73d8a49eeb85d32cf465507dd71d507100c1';
+        } else {
+            $fromAccount = $this->accounts[0];
+        }
+        if (!isset($this->accounts[1])) {
+            $toAccount = '0x407d73d8a49eeb85d32cf465507dd71d507100c2';
+        } else {
+            $toAccount = $this->accounts[1];
+        }
+        $contract->bytecode($this->testBytecode)->new(10000, 'Game Token', 1, 'GT', [
+            'from' => $fromAccount,
+            'gas' => '0x200b20'
+        ], function ($err, $result) use ($contract) {
+            if ($err !== null) {
+                return $this->fail($err->getMessage());
+            }
+            if ($result) {
+                echo "\nTransaction has made:) id: " . $result . "\n";
+            }
+            $transactionId = $result;
+            $this->assertTrue((preg_match('/^0x[a-f0-9]{64}$/', $transactionId) === 1));
+
+            $contract->eth->getTransactionReceipt($transactionId, function ($err, $transaction) {
+                if ($err !== null) {
+                    return $this->fail($err);
+                }
+                if ($transaction) {
+                    $this->contractAddress = $transaction->contractAddress;
+                    echo "\nTransaction has mind:) block number: " . $transaction->blockNumber . "\n";
+                }
+            });
+        });
+
+        $constructorData = $contract->bytecode($this->testBytecode)->getData(10000, 'Game Token', 1, 'GT');
+
+        $this->assertEquals('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', $constructorData);
+
+        if (!isset($this->contractAddress)) {
+            $this->contractAddress = '0x407d73d8a49eeb85d32cf465507dd71d507100c2';
+        }
+
+        $balanceOfData = $contract->at($this->contractAddress)->getData('balanceOf', $fromAccount);
+
+        $this->assertEquals('70a082310000000000000000000000005ec4b94c93b60f233f9cc31ac9614c7b29fe1c62', $balanceOfData);
+    }
 }
\ No newline at end of file