Building information modeling (BIM) related technologies have been widely used in recent years. Dueto itsnon-structural and growing volume, BIM data puts forward higher requirements tostorage system. In this paper, we design and implement a distributed file systemto store BIM data with high availability, load balancing, and horizontalexpansion. The FastDFs and HDFS(Hadoop distributed filesystem) are basically used to store small files and large files respectively. On top of this arrangement, Nginx reverse proxy server with Keepalived module is deployed tounify the user access port, and encapsulate the Web API to manage the BIM data. Preliminary experiment results show that our approach achieves better performance.