Regarding problems of information transmission technology for greenhouse measuring and controlling system, a dynamic star wireless sensor network was proposed according to greenhouse structure. In view of cost-effective and low energy consumption, frequency hopping timing methods were combined with sub-nodes to form sub network for mobile aggregation node, which reduces point-to-point traffic span as much as possible. Using frame extension method, complex communication network was achieved based on the low energy consumption chip, nRF2401A. Communication algorithm is introduced for sensor nodes, control nodes and aggregation nodes. Energy consumption of sub-nodes within network was analyzed under different working conditions of aggregation nodes. Research results indicate that communication method of dynamic star wireless sensor network saves energy effectively, and data transmission is effective.