In order to improve the reliability of remote links and the security of remote process, combined with the control integration system, a new method of remote security check based on the communication protocol is presented for the remote operation. This paper focuses on the safety and reliability of remote operation and analyzes the original remote operation process and IEC60870-5-104 communication protocol of power system to find out the shortcomings of the original method and communication protocol. The innovative remote double check method of remote security check is put forward and the IEC60870-5-104 communication protocol is also expanded, and the effectiveness is verified.