In recent years, wireless sensors are widely used in various fields, and the research about energy-efficiency strategies is emerging in an endless stream. As a key technology of information sharing and distribution, the energy-efficiency research about caching technologies has been one of research hot spots. Based on the cache replacement algorithm and the basic thought that adopts the replacement cost study, this research analyses the existing cache replacement algorithm firstly, then integrates the two cache replacement algorithms based on low energy consumption or high cache hit and refines one cache replacement algorithm that combines both advantages, which follows the on-demand cache placement policy based on dichotomy and the cache replacement strategy in wireless sensor network. At last, the simulation proves that, this algorithm has varied degrees of advancement in the following three aspects:the average delay time, energy consumption and cache hit.