A computer server system includes a server cabinet, and at least one server accommodated in the server cabinet. The server forms a fixing structure at each of four corners thereof. In addition, the server cabinet includes fixing structures which are correspondingly matched with the fixing structures of the server. The fixing structure of the server cabinet can be in the form of protrusions, mounting holes, and engagement holes. The fixing structure of the server can be in the form of ears and mounting grooves. The server is mounted in the server cabinet by means of the fixing structures thereof.