Cannot send data from MCU to ESP on STM32F401 and ESP8266-01

I am working on an STM32f401 Nucleo board(datasheet for reference: http://www.kynix.com/uploadfiles/pdf65976/STM32F401CCU6.pdf) and ESP8266-01 wifi module.
I am using Eclipse gcc-arm tool chain and cubeMx to generate code. I can transfer and receive data perfectly with USART/UART DMA.

Now I am stuck with ESP8266-01. I cannot send data from MCU to ESP and I’m not getting response from ESP to MCU. I already tested the ESP module communication, I can concnect TO THE wifi with AT commands through USB and can also receive data in web via socket connection.

BTW，I configured USART1_TX/USART1_RX with PA9/PA10