diff --git a/doc/run_software_xdma_bram.md b/doc/run_software_xdma_bram.md
index 09be01af68f17f4015b4f10fd1c9c86524e3e81c..dbf17a56d11b0d7cfe17737b1ff4d6a38b463419 100644
--- a/doc/run_software_xdma_bram.md
+++ b/doc/run_software_xdma_bram.md
@@ -39,7 +39,7 @@ $ sudo ./xdma_rw random.bin to /dev/xdma0_h2c_0 0 256
 然后运行以下命令，把刚刚写入的数据读回来，存到 `receive.bin` 文件里
 
 ```bash
-$ sudo ./xdma_rw receive.bin from /dev/xdma0_c2h 0 256
+$ sudo ./xdma_rw receive.bin from /dev/xdma0_c2h_0 0 256
 # 参数1 : "receive.bin" 是要写入的文件
 # 参数2 : "from" 代表方向是 device-to-host
 # 参数3 : "/dev/xdma0_c2h_0" 是设备文件，用来从FPGA中读数据