In order to make multiple disks accessible parallelly, the stripe layout is adopted by RAID for high-bandwidth. The approach is appropriate for big sequential data access, but is not that effective for small data random access. This paper analyzed the I/O performance based on RAID Stripe size, explored the IOPS（IOs per second）of multiple user small data access, and proposed a new stripe layout architecture—Thick Granularity Model. The simulation indicates: the I/O performance of Thick Granularity Model has been improved，especially in small data random access.

Query processing is one of the most important technologies in sensor networks. To reduce energy consumption of query, a small world based query strategy named Contact-Assisted poweR-efficient Direction-sense-achieved query strategy for Sensor Networks （CardSN） was presented. In CardSN, Contacts act as shortcuts to bring down the average path length of the network; a distributed relative localization algorithm was introduced to achieve a sense of direction. Experimental results show that CardSN has good scalability and can save more energy than ZRP and CAPTURE. Therefore, CardSN is of high-performance and energy-efficiency.