The present invention provides a method and system for controlling access of a terminal device to a wireless network. The method includes: receiving, by an access point device, a first wireless network access request message sent by a first terminal device; receiving, by the access point device, feedback information of one or more directional devices within a predetermined area; judging, by the access point device according to the received feedback information, whether N directional devices within the predetermined area all find the first wireless network access request message by monitoring; and if yes, enabling the first terminal device to access the wireless network, where the N is the number of the directional devices within the predetermined area.