Wireless sensor network usually consists of a large number of tiny sensor nodes, it can collect data in a variety of environment, it is limited by the battery to carry the energy to supply energy, usually deployed in a complex regional environment, and even the staff can not reach an occasion. Therefore, sensor networks nodes have limited capacity, and can not be replaced, how the efficient use of energy is the primary challenge faced by sensor networks. MAC protocol is the bottom of sensor network protocol for sensor network have a great impact on performance. The paper discusses wireless sensor network in a self-organizing wireless sensor network protocol--the basic idea of SMACS protocol, to study the main reasons for energy waste caused by the nodes, and provides a new, more energy efficient SMACS agreement improved algorithm for super-frame.