diff --git a/APP_Framework/Applications/app_test/Makefile b/APP_Framework/Applications/app_test/Makefile
index 36a913ca6..227cd29d6 100644
--- a/APP_Framework/Applications/app_test/Makefile
+++ b/APP_Framework/Applications/app_test/Makefile
@@ -66,7 +66,12 @@ ifeq ($(CONFIG_ADD_XIZI_FEATURES),y)
     endif
 
     ifeq ($(CONFIG_USER_TEST_RS485),y)
-        SRC_FILES += test_rs485.c
+        ifeq ($(CONFIG_ARCH_RISCV),y)
+        SRC_FILES += test_rs485_riscv.c
+        endif
+        ifeq ($(CONFIG_ARCH_ARM),y)
+        SRC_FILES += test_rs485_arm.c
+        endif
     endif    
 
     ifeq ($(CONFIG_USER_TEST_HWTIMER),y)
diff --git a/APP_Framework/Applications/app_test/test_rs485.c b/APP_Framework/Applications/app_test/test_rs485_arm.c
similarity index 100%
rename from APP_Framework/Applications/app_test/test_rs485.c
rename to APP_Framework/Applications/app_test/test_rs485_arm.c
diff --git a/APP_Framework/Applications/app_test/test_rs485_riscv.c b/APP_Framework/Applications/app_test/test_rs485_riscv.c
new file mode 100644
index 000000000..a31035ebc
--- /dev/null
+++ b/APP_Framework/Applications/app_test/test_rs485_riscv.c
@@ -0,0 +1,108 @@
+/*
+* Copyright (c) 2020 AIIT XUOS Lab
+* XiUOS is licensed under Mulan PSL v2.
+* You can use this software according to the terms and conditions of the Mulan PSL v2.
+* You may obtain a copy of Mulan PSL v2 at:
+*        http://license.coscl.org.cn/MulanPSL2
+* THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
+* EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
+* MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
+* See the Mulan PSL v2 for more details.
+*/
+
+/**
+* @file:    test_rs485.c
+* @brief:   a application of rs485 function
+* @version: 1.1
+* @author:  AIIT XUOS Lab
+* @date:    2022/12/17
+*/
+#include <stdio.h>
+#include <string.h>
+#include <transform.h>
+#ifdef ADD_XIZI_FEATURES
+
+#define BSP_485_DIR_PIN 24
+
+void Test485(void)
+{
+    int pin_fd = PrivOpen(RS485_PIN_DEV_DRIVER, O_RDWR);
+    if (pin_fd < 0)
+    {
+        printf("open pin fd error:%d\n", pin_fd);
+        return;
+    }
+
+    int uart_fd = PrivOpen(RS485_UART_DEV_DRIVER, O_RDWR);
+    if (uart_fd < 0)
+    {
+        printf("open pin fd error:%d\n", uart_fd);
+        return;
+    }
+    printf("uart and pin fopen success\n");
+
+    //config led pin in board
+    struct PinParam pin_parameter;
+    memset(&pin_parameter, 0, sizeof(struct PinParam));
+    pin_parameter.cmd = GPIO_CONFIG_MODE;
+    pin_parameter.pin = BSP_485_DIR_PIN;
+    pin_parameter.mode = GPIO_CFG_OUTPUT;
+
+    struct PrivIoctlCfg ioctl_cfg;
+    ioctl_cfg.ioctl_driver_type = PIN_TYPE;
+    ioctl_cfg.args =  (void *)&pin_parameter;
+
+    if (0 != PrivIoctl(pin_fd, OPE_CFG, &ioctl_cfg)) {
+        printf("ioctl pin fd error %d\n", pin_fd);
+        PrivClose(pin_fd);
+        return;
+    }
+
+    struct SerialDataCfg uart_cfg;
+    memset(&uart_cfg, 0, sizeof(struct SerialDataCfg));
+
+    uart_cfg.serial_baud_rate = BAUD_RATE_115200;
+    uart_cfg.serial_data_bits = DATA_BITS_8;
+    uart_cfg.serial_stop_bits = STOP_BITS_1;
+    uart_cfg.serial_parity_mode = PARITY_NONE;
+    uart_cfg.serial_bit_order = BIT_ORDER_LSB;
+    uart_cfg.serial_invert_mode = NRZ_NORMAL;
+    uart_cfg.serial_buffer_size = SERIAL_RB_BUFSZ;
+    uart_cfg.serial_timeout = 1000;
+    uart_cfg.is_ext_uart = 0;
+
+    ioctl_cfg.ioctl_driver_type = SERIAL_TYPE;
+    ioctl_cfg.args = (void *)&uart_cfg;
+
+    if (0 != PrivIoctl(uart_fd, OPE_INT, &ioctl_cfg))
+    {
+        printf("ioctl uart fd error %d\n", uart_fd);
+        PrivClose(uart_fd);
+        return;
+    }
+
+    struct PinStat pin_dir;
+    pin_dir.pin = BSP_485_DIR_PIN;
+    while (1)
+    {
+        pin_dir.val = GPIO_HIGH;
+        PrivWrite(pin_fd,&pin_dir,0);
+        PrivWrite(uart_fd,"Hello world!\n",sizeof("Hello world!\n"));
+        printf("Send: Hello world!\n");
+        PrivTaskDelay(1000);
+
+        pin_dir.val = GPIO_LOW;
+        PrivWrite(pin_fd,&pin_dir,0);
+        char recv_buff[100];
+        memset(recv_buff,0,sizeof(recv_buff));
+        PrivRead(uart_fd,recv_buff,20);
+        printf("Recv: %s\n",recv_buff);
+        PrivTaskDelay(1000);
+    }
+    PrivClose(pin_fd);
+    PrivClose(uart_fd);
+    return;
+}
+
+PRIV_SHELL_CMD_FUNCTION(Test485, a RS485 test sample, PRIV_SHELL_CMD_MAIN_ATTR);
+#endif
\ No newline at end of file