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Combined with the characteristics of greenhouse measurement and control system, the spatial structure and time sequence of wireless sensor network were constructed to reduce and balance node energy consumption to prolong network lifetime. As to the network spatial structure, each mobile sink node located at the upper side of greenhouse, could provide abundant energy. Taking the mobile sink nodes as hinges, the limited energy sub-nodes made up of the stelliform wireless network. As to the network time sequence, the sub-nodes were active only in communication duration and sleeping in other phases. The maximal communication radius of sub-nodes and the minimal communication radius of sink nodes were analyzed to solve the problem of network connectivity.