diff --git a/tools/harness-thci/OpenThread.py b/tools/harness-thci/OpenThread.py
index d536c9c31..0d94f8292 100644
--- a/tools/harness-thci/OpenThread.py
+++ b/tools/harness-thci/OpenThread.py
@@ -1145,6 +1145,10 @@ class OpenThreadTHCI(object):
                         self, timeout * 2))
                 else:
                     return False
+
+        if self.IsBorderRouter:
+            self._waitBorderRoutingStabilize()
+
         return True
 
     @API
@@ -1609,6 +1613,30 @@ class OpenThreadTHCI(object):
         else:
             return False
 
+    @watched
+    def getNetworkData(self):
+        lines = self.__executeCommand('netdata show')
+        prefixes, routes, services = [], [], []
+        classify = None
+
+        for line in lines:
+            if line == 'Prefixes:':
+                classify = prefixes
+            elif line == 'Routes:':
+                classify = routes
+            elif line == 'Services:':
+                classify = services
+            elif line == 'Done':
+                classify = None
+            else:
+                classify.append(line)
+
+        return {
+            'Prefixes': prefixes,
+            'Routes': routes,
+            'Services': services,
+        }
+
     @API
     def setNetworkIDTimeout(self, iNwkIDTimeOut):
         """set networkid timeout for Thread device
@@ -3112,6 +3140,14 @@ class OpenThreadTHCI(object):
     def setLeaderWeight(self, iWeight=72):
         self.__executeCommand('leaderweight %d' % iWeight)
 
+    @watched
+    def isBorderRoutingEnabled(self):
+        try:
+            self.__executeCommand('br omrprefix')
+            return True
+        except CommandError:
+            return False
+
     def __detectZephyr(self):
         """Detect if the device is running Zephyr and adapt in that case"""
 
diff --git a/tools/harness-thci/OpenThread_BR.py b/tools/harness-thci/OpenThread_BR.py
index b8566fe49..ac6747972 100644
--- a/tools/harness-thci/OpenThread_BR.py
+++ b/tools/harness-thci/OpenThread_BR.py
@@ -695,3 +695,30 @@ class OpenThread_BR(OpenThreadTHCI, IThci):
         """
         self.externalCommissioner.MLR([sAddr], 0)
         return True
+
+    @watched
+    def _waitBorderRoutingStabilize(self):
+        """
+        Wait for Network Data to stabilize if BORDER_ROUTING is enabled.
+        """
+        if not self.isBorderRoutingEnabled():
+            return
+
+        MAX_TIMEOUT = 30
+        MIN_TIMEOUT = 15
+        CHECK_INTERVAL = 3
+
+        time.sleep(MIN_TIMEOUT)
+
+        lastNetData = self.getNetworkData()
+        for i in range((MAX_TIMEOUT - MIN_TIMEOUT) // CHECK_INTERVAL):
+            time.sleep(CHECK_INTERVAL)
+            curNetData = self.getNetworkData()
+
+            # Wait until the Network Data is not changing, and there is OMR Prefix and External Routes available
+            if curNetData == lastNetData and len(curNetData['Prefixes']) > 0 and len(curNetData['Routes']) > 0:
+                break
+
+            lastNetData = curNetData
+
+        return lastNetData