The invention provides a network access processing method and system. The method includes: a WLANAN (Wireless Local-Area Network Access Network) acquires TWAG (Trusted WLANAccess Gateway) address information of a TWAG, wherein UE accesses an EPC (Evolved Packet Core) through a TWAN (Trusted WLAN Access Network) and the TWAN includes the WLANAN, the TWAG, a trustable WLAN AAA (Authentication, Authorization and Accounting) agent TWAP (Trusted WLAN AAA Proxy); the TWAP receives the TWAG address information sent by the WLANAN; and the TWAP performs network access processing according to the TWAG address information in combination with the TWAG. Through the network access processing method and system, a problem of how to perform connection processing in the TWAN in the prior art is solved and thus a processing process in the TWAN during a process in which the UE accesses the EPC through the WLAN is cleared and possibility is provided to follow-up system optimization.