Journal of Digital Information Management Yueshun He, Wei Zhang, Nan Jiang, Lihua Li, Xiaoyan Luo 13 4 2015 http://dline.info/fpaper/jdim/v13i4/v13i4_7.pdf Cloud computing is fundamental for wireless sensor network. Firstly massive data is gathered by Wireless sensor. Then those data is sent to platform of cloud computing. In the platform data is shared and transferred. The whole System is controlled and managed. In the process reliable and integrity of data depends on performance of wireless sensor Networks Topology control is one of core key factors which can influence performance of wireless-sensor networks (WSN). So how to design topology structure with high reliable and survivability is becoming the important subject on wireless-sensor networks. For the issue, a topology evolution strategy based on scale-free network with energy efficient is proposed. First by clustering algorithm cluster nodes are distributed evenly. Then those nodes start evolving in accordance with random walk processes on scale-free network. Since some key factors such as residual energy of node and node degree are taken into account in evolving procedure, network topology obtains quality features such as load and energy balance. So the network is quite practical. Finally the simulation shows that network topology from the evolution algorithm have good robustness regardless of deliberate and random attack. Consequently robustness feature of wireless-sensor network under severe environment is satisfied.