With the development of the computer and network technology, the growing demands for the huge data storage and the high-performance data access make the storage systembasedon network becoming a research hotspot, especially the research of I/O subsystem about network server system. The research about distributed file system as a key part in the network server system is meaningful. Currently open source community provides several DFS(distributed file system) projects, such as KFS, moosefs, FastDFS, TFS, GFS. Most of projects support only API or storage gateway on Linux system, but not giving support API or storage gateway on Windows system. This study introduces the designing frameworks and the thinking process aboutstorage gateway on Windows system, and then gives a specific example program based on HDFS—dfsclient.