In order to improve standardization and safety of the public communication network, the data communication network and information network are supposed to be integrated and deployed together based on the cloud platform technology. The growth of communication data raises higher demands for the QoS service quality of the fused network, and also for the resource consumption of the base station and users. According to the QoS demand of the integration mechanism, a mechanism of communication between nodes, which combines distributed Caching with D2D, is proposed for the integration of two networks. According to the resource constraints to the base station and users, it is proposed to add transmission consumption and D2D signaling cost as constraints to the existing model to obtain a more reasonable distribution of the cache. The proposed approach is applied to the network integration case of the State Grid Corporation of China. It makes the communication mechanism of the integrated network more consistent with actual demand, and achieves good results. This work is supported by National Natural Science Foundation of China (No. 61371068).