diff --git a/tests/common/devices/onyx.py b/tests/common/devices/onyx.py
index b3f467b72dc..3169213d77a 100644
--- a/tests/common/devices/onyx.py
+++ b/tests/common/devices/onyx.py
@@ -189,19 +189,6 @@ def set_speed(self, interface_name, speed):
             speed = 'auto'
         else:
             speed = speed[:-3] + 'G'
-            # The speed support list for onyx is like '1G 10G 25G 40G 50Gx1 50Gx2 100Gx2 100Gx4 200Gx4'.
-            # We need to set the speed according to the speed support list.
-            # For example, when dut and fanout all support 50G,
-            # if support speed list of fanout just includes 50Gx1 not 50G,
-            # we need to set the speed with 50Gx1 instead of 50G, otherwise, the port can not be up.
-            all_support_speeds = self.get_supported_speeds(interface_name, raw_data=True)
-            for support_speed in all_support_speeds:
-                if speed in support_speed:
-                    logger.info("Speed {} find the matched support speed:{} ".format(speed, support_speed))
-                    speed = support_speed
-                    break
-            logger.info("set speed is {}".format(speed))
-
         if autoneg_mode or speed == 'auto':
             out = self.host.onyx_config(
                     lines=['shutdown', 'speed {}'.format(speed), 'no shutdown'],