diff --git a/misc/acrn-config/library/board_cfg_lib.py b/misc/acrn-config/library/board_cfg_lib.py
index 5375af51b..b9c0ec4d2 100644
--- a/misc/acrn-config/library/board_cfg_lib.py
+++ b/misc/acrn-config/library/board_cfg_lib.py
@@ -375,9 +375,14 @@ def get_board_private_vuart(branch_tag, tag_console):
             vuart0_console_dic[ttys_n] = NATIVE_CONSOLE_DIC[ttys_n]
 
     # VUART1
-    if len(vuart1_valid_console) == 4:
-        vuart1_console_dic[ttys_n] = alloc_irq()
+    if len(NATIVE_CONSOLE_DIC) >= 2:
+        # There are more than 1 serial port in native, we need to use native ttyS1 info for vuart1 which include
+        # base ioport and irq number.
+        if 'ttyS1' in NATIVE_CONSOLE_DIC.keys():
+            vuart1_console_dic['ttyS1'] = NATIVE_CONSOLE_DIC['ttyS1']
     else:
+        # There is only one native serial port. We hardcode base ioport for vuart1 and allocate a irq which is
+        # free in native env and use it for vuart1 irq number
         vuart1_console_dic[vuart1_valid_console[0]] = alloc_irq()
 
     return (err_dic, vuart0_console_dic, vuart1_console_dic)