Method and communication system for increasing paging capacity of EVDO (Evolution Data Only) system

An embodiment of the invention discloses a method and a communication system for increasing paging capacity of an EVDO (Evolution Data Only) system. The method comprises the following steps that perpendicularity of a Walsh code corresponding to MacIndex is utilized in advance, and an unused MacIndex value is correspondingly distributed to a new control channel respectively; a base station broadcasts control channel information of a plurality of control channels through an empty system message, and the control channels include the new control channel; after a user terminal receives the control channel information, a Hash function is utilized to carry out HASH operation on the number of the control channels and an IMSI (International Mobile Subscriber Identity) of the user terminal, so that the control channel of the user terminal, which needs to be resident, is obtained, and the control channel is resident; and a base station controller BSC responds to the need to issue the paging information to the user terminal, the Hash function is utilized to carry out HASH operation on the number of the control channels and the IMSI of the user terminal, so that the resident control channel of the user terminal is obtained, and the paging information of the user terminal is transmitted on the resident control channel of the user terminal. According to the embodiment of the invention, the paging capacity in the EVDO system can be increased.