Abstract:  How to transmit the information via cooperative MIMO based on cooperation among the sensor nodes in wireless sensor networks is introduced firstly. Then, taking into account the characteristic of wireless sensor networks, the outage probability based on Nakagami channel is discussed. This paper not only establishes an optimization model for minimizing the system outage probability under sleep mechanism and restricted total power, which power includes both the transmission energy and the circuit energy consumption, but also discusses the solution in theory. Simulations are presented in the end to verify the algorithm.