The invention discloses a method for realizing a mobile application function at a PC terminal through a VSA technology, and the method comprises the following steps: S1, enabling an applied PC clientto communicate with a VSA server, and enabling the PC client to send a first instruction; S2, enabling the VSA server to communicate with the VSA client, and forward the first instruction; S3, the VSAclient communicates with the application mobile client, and forwards the first instruction from the VSA server; S4, enabling the application mobile client to receive the first instruction of the VSAserver, executes the first instruction and sends a second instruction to the VSA client; And S5, enabling the VSA client to forward the second instruction to the application server. Compared with theprior art, the PC client side calls the interface of the mobile client side and the server side for communication through the VSA technology, and the problem that the contents of the mobile side and the PC side are not synchronous is effectively avoided.