The invention relates to a server gray scale upgrading method and apparatus, and a corresponding gray scale upgrading server. The server gray scale upgrading method comprises the following steps: simultaneously sending the service request of a client to an old server and a new server, sending the feedback result of the old server to a corresponding client end, comparing the feedback result of the old server and the feedback result of the new server, and obtaining a comparison result; according to the comparison result, determining that the service request is simultaneously sent to the old server and the new server, sending the feedback result of the new server to the corresponding client end, and detecting the response of the client end; and according to the response of the client end, only sending the service request to the new server, and sending the feedback result of the new server to the corresponding client end. The invention also relates to a server gray scale upgrading apparatus. By using the server gray scale upgrading method and apparatus, server upgrading is carried out by use of a multidimensional gray scale upgrading mode, the risks are low, the efficiency is high, and smooth server upgrading can be realized.