Now the mobile communication network is facing with a series of the problem which is related to the undercapacity

capacity expansion constrained and so on.The strategy of the dual-frequency network is proposed in the article.It is experimented that the pressure of the 900MHz network can be efficiently reduced by applying the dual-frequency network strategy.By adding the 1800MHz TRX of the urban network of city

the quality of the net is further upgrading

and the customer’s feeling of net is improving.