Abstract: Researching many cache invalidation strategies, we propose a performance analyzing model which can evaluate the cache schemes in the mobile computing environments. Based on some parameters-the update rate, the hitting "hot spot" rate, the bandwidth of the wireless, the overhead of the uplink and downlink, etc., the throughput of cache strategies can be computed. Using this model, we evaluate the performance of four schemas-no caching, ideal strategies, timestamp, mobile agent. Our study shows that this model is intensive practicability.