With the increasing requirements of applications and developments in computer science, research on networking storage system (NSS) becomes hot spot of I/O subsystem research. As one of the core components of NSS, distributed file systems should be paid much attention to. Based on the study of the existing research results, BlueWhale File System (BWFS) was designed by NRCHPC, the Institute of Computing technology, the Chinese Academy of Sciences. And it enables large capacity, high throughput and high scalability of BW1K NSS. In this paper, we described architecture of BWFS and its major characteristics are described and the test results of BW1K NSS are used to verify these characteristics.