The invention discloses a method, a device and system for carrying out stretch processing on a virtual application server in cloud computing, and belongs to the technical field of the Internet. The method comprises the following steps that: obtaining the load balancing weight of a first virtual application server which does not send a load state message, and a load state message which is sent by the first virtual application server last time; according to the load balancing weight of the first virtual application server and the load state message which is sent by the first virtual application server last time, determining the current load state message of the first virtual application server; and according to the current load state message of the first virtual application server and the current load state messages of other virtual application servers, carrying out the stretch processing. when the method is adopted, stretch processing timeliness can be improved.