diff --git a/tests/config/node_config.py b/tests/config/node_config.py
index bcb42c9..71b97c5 100644
--- a/tests/config/node_config.py
+++ b/tests/config/node_config.py
@@ -1,3 +1,5 @@
+import os
+
 from web3 import Web3
 
 ZGS_CONFIG = {
@@ -22,6 +24,8 @@ ZGS_CONFIG = {
     }
 }
 
+CONFIG_DIR = os.path.dirname(__file__)
+ZGS_KEY_FILE = os.path.join(CONFIG_DIR, "zgs", "network", "key")
 ZGS_NODEID = "16Uiu2HAmLkGFUbNFYdhuSbTQ5hmnPjFXx2zUDtwQ2uihHpN9YNNe"
 
 BSC_CONFIG = dict(
diff --git a/tests/config/zgs/network/enr.dat b/tests/config/zgs/network/enr.dat
deleted file mode 100644
index dc87bde..0000000
--- a/tests/config/zgs/network/enr.dat
+++ /dev/null
@@ -1 +0,0 @@
-enr:-Ly4QJZwz9htAorBIx_otqoaRFPohX7NQJ31iBB6mcEhBiuPWsOnigc1ABQsg6tLU1OirQdLR6aEvv8SlkkfIbV72T8CgmlkgnY0gmlwhH8AAAGQbmV0d29ya19pZGVudGl0eZ8oIwAAAAAAADPyz8cpvYcPpUtQMmYOBrTPKn-UAAIAiXNlY3AyNTZrMaEDeDdgnDgLPkxNxB39jKb9f1Na30t6R9vVolpTk5zu-hODdGNwgir4g3VkcIIq-A
\ No newline at end of file
diff --git a/tests/network_discovery_test.py b/tests/network_discovery_test.py
index aa06f76..08d0156 100644
--- a/tests/network_discovery_test.py
+++ b/tests/network_discovery_test.py
@@ -3,7 +3,7 @@
 import os
 import time
 
-from config.node_config import ZGS_NODEID
+from config.node_config import ZGS_KEY_FILE, ZGS_NODEID
 from test_framework.test_framework import TestFramework
 from utility.utils import p2p_port
 
@@ -17,13 +17,9 @@ class NetworkDiscoveryTest(TestFramework):
         self.num_nodes = 3
 
         # setup for node 0 as bootnode
-        tests_dir = os.path.dirname(__file__)
-        network_dir = os.path.join(tests_dir, "config", "zgs", "network")
+        self.zgs_node_key_files = [ZGS_KEY_FILE]
         bootnode_port = p2p_port(0)
         self.zgs_node_configs[0] = {
-            # load pre-defined keypair
-            "network_dir": network_dir,
-
             # enable UDP discovery relevant configs
             "network_enr_address": "127.0.0.1",
             "network_enr_tcp_port": bootnode_port,
diff --git a/tests/network_discovery_upgrade_test.py b/tests/network_discovery_upgrade_test.py
index d37ce1e..f20067f 100644
--- a/tests/network_discovery_upgrade_test.py
+++ b/tests/network_discovery_upgrade_test.py
@@ -3,7 +3,7 @@
 import os
 import time
 
-from config.node_config import ZGS_NODEID
+from config.node_config import ZGS_KEY_FILE, ZGS_NODEID
 from test_framework.test_framework import TestFramework
 from utility.utils import p2p_port
 
@@ -17,13 +17,9 @@ class NetworkDiscoveryUpgradeTest(TestFramework):
         self.num_nodes = 2
 
         # setup for node 0 as bootnode
-        tests_dir = os.path.dirname(__file__)
-        network_dir = os.path.join(tests_dir, "config", "zgs", "network")
+        self.zgs_node_key_files = [ZGS_KEY_FILE]
         bootnode_port = p2p_port(0)
         self.zgs_node_configs[0] = {
-            # load pre-defined keypair
-            "network_dir": network_dir,
-
             # enable UDP discovery relevant configs
             "network_enr_address": "127.0.0.1",
             "network_enr_tcp_port": bootnode_port,
diff --git a/tests/test_framework/test_framework.py b/tests/test_framework/test_framework.py
index 0124eaa..0fc03a3 100644
--- a/tests/test_framework/test_framework.py
+++ b/tests/test_framework/test_framework.py
@@ -55,6 +55,7 @@ class TestFramework:
         self.lifetime_seconds = 3600
         self.launch_wait_seconds = 1
         self.num_deployed_contracts = 0
+        self.zgs_node_key_files = []
 
         # Set default binary path
         binary_ext = ".exe" if is_windows_platform() else ""
@@ -190,6 +191,10 @@ class TestFramework:
             else:
                 updated_config = {}
 
+            zgs_node_key_file = None
+            if i < len(self.zgs_node_key_files):
+                zgs_node_key_file = self.zgs_node_key_files[i]
+
             assert os.path.exists(self.zgs_binary), (
                 "%s should be exist" % self.zgs_binary
             )
@@ -202,6 +207,7 @@ class TestFramework:
                 self.mine_contract.address(),
                 self.reward_contract.address(),
                 self.log,
+                key_file=zgs_node_key_file,
             )
             self.nodes.append(node)
             node.setup_config()
diff --git a/tests/test_framework/zgs_node.py b/tests/test_framework/zgs_node.py
index a27a194..fa2bd31 100644
--- a/tests/test_framework/zgs_node.py
+++ b/tests/test_framework/zgs_node.py
@@ -24,6 +24,7 @@ class ZgsNode(TestNode):
         log,
         rpc_timeout=10,
         libp2p_nodes=None,
+        key_file=None,
     ):
         local_conf = ZGS_CONFIG.copy()
         if libp2p_nodes is None:
@@ -54,6 +55,7 @@ class ZgsNode(TestNode):
         # Overwrite with personalized configs.
         update_config(local_conf, updated_config)
         data_dir = os.path.join(root_dir, "zgs_node" + str(index))
+        self.key_file = key_file
         rpc_url = "http://" + rpc_listen_address
         super().__init__(
             NodeType.Zgs,
@@ -68,10 +70,16 @@ class ZgsNode(TestNode):
 
     def setup_config(self):
         os.mkdir(self.data_dir)
+
         log_config_path = os.path.join(self.data_dir, self.config["log_config_file"])
         with open(log_config_path, "w") as f:
             f.write("trace,hyper=info,h2=info")
 
+        if self.key_file is not None:
+            network_dir = os.path.join(self.data_dir, "network")
+            os.mkdir(network_dir)
+            shutil.copy(self.key_file, network_dir)
+
         initialize_toml_config(self.config_file, self.config)
 
     def wait_for_rpc_connection(self):