Based on the situation analysis of the traditional job instruction and 3D job instruction, this paper develops a BIM-based 3D instruction system, which combining with the traditional job instruction, takes the technical index, the key points of operation, and resource allocation as the core, the process flow as the main line, and the BIM model as the carrier.The system consists of basic databases, editing clients and browsing clients. The basic data is composed of BIM models and documents, which are stored in the cloud platform.Through editing clients can implement the import of basic data, the correlation between data, the audit and release of 3D job instruction, and etc. Browsing client can be used for the 3D visualization of the job instruction. The system developed in this paper enables mobile office and visual guidance on site construction of the job instruction, and forms aknowledge library of 3D job instruction, making the instruction more intuitive and convenient.