The invention discloses a method employing an SM2 elliptical curve algorithm to achieve encryption in an OpenSSL. The method comprises the steps that a server generates a random large number, calculates random fixed point data on an elliptical curve, and transmits the data to a client through a Server Hello Done message; the client analyzes the fixed point data from the server through the received message, enables a public key of the server and public and private keys of the client to serve as parameters of the SM2, and calculates a main key; the client randomly generates one random large number, calculates the random fixed point data on the elliptical curve, enables the fixed point data and the public key of the client to be transmitted to the server through Client Key Exchange message; and the server obtains the random fixed point data of the client and the public key of the client, enables the public and private keys of the servers to serve as the parameters of the SM2, and calculates the main key. The method is high in reliability, and is safe and stable in operation.