An access method for a WiFi access point, comprising: the access point accessing a Third Generation, 3G, network and obtaining its own Internet Protocol, IP, address in the 3G network (S401); the access point obtaining an IP address of an Access Controller, AC, through a preset AC domain name and an address server of the 3G network, wherein the AC is connected with the 3G network (S402); and the access point establishing a connection with the AC through its own IP address in the 3G network (S403); characterised in that the access point accessing the 3G network and obtaining its own IP address in the 3G network comprises: the access point being registered and authenticated in the 3G network (S701); and the access point performing Packet Data Protocol, PDP, activation (S703) and obtaining its own IP address in the 3G network (S704); wherein the access point obtaining the IP address of the AC through the preset AC domain name and the address server of the 3G network, comprises: the access point being connected with the address server of the 3G network through its own IP address in the 3G network (S705); and obtaining the IP address of the AC from the address server of the 3G network through the AC domain name preset in the access point (S705). the access point accessing a Third Generation, 3G, network and obtaining its own Internet Protocol, IP, address in the 3G network (S401); the access point obtaining an IP address of an Access Controller, AC, through a preset AC domain name and an address server of the 3G network, wherein the AC is connected with the 3G network (S402); and the access point establishing a connection with the AC through its own IP address in the 3G network (S403); characterised in that the access point accessing the 3G network and obtaining its own IP address in the 3G network comprises: the access point being registered and authenticated in the 3G network (S701); and the access point performing Packet Data Protocol, PDP, activation (S703) and obtaining its own IP address in the 3G network (S704); wherein the access point obtaining the IP address of the AC through the preset AC domain name and the address server of the 3G network, comprises: the access point being connected with the address server of the 3G network through its own IP address in the 3G network (S705); and obtaining the IP address of the AC from the address server of the 3G network through the AC domain name preset in the access point (S705). the access point being registered and authenticated in the 3G network (S701); and the access point performing Packet Data Protocol, PDP, activation (S703) and obtaining its own IP address in the 3G network (S704); wherein the access point obtaining the IP address of the AC through the preset AC domain name and the address server of the 3G network, comprises: the access point being connected with the address server of the 3G network through its own IP address in the 3G network (S705); and obtaining the IP address of the AC from the address server of the 3G network through the AC domain name preset in the access point (S705). the access point being connected with the address server of the 3G network through its own IP address in the 3G network (S705); and obtaining the IP address of the AC from the address server of the 3G network through the AC domain name preset in the access point (S705). <EOS>