Method and system for identifying user-defined application

The invention discloses a method and system for identifying a user-defined application, belongs to the technical field of user-defined application identification, and solves the problem that the identification performance of the user-defined application is obviously reduced along with the increase of the number and dimensions of user-defined application rules in the prior art. The method for identifying a user-defined application comprises the steps of initializing a global variable; newly adding a custom application rule, storing dimension information of the custom application, applying for amemory for the dimension information, and assigning the dimension information to a corresponding bitmap pointer; according to the ID of the custom application, setting the bit where the unset dimension information is located; and analyzing the message to obtain the dimension information, obtaining the corresponding bitmap pointer information, and performing bit and operation on the bitmap pointerinformation to obtain the