The communication between various heterogeneous information sources and industrial equipment is the key technology to realize intelligent manufacturing.A bus bridge communication system based on OPC UA (OPC unified architecture) was developed for this problem.An embedded bus bridge was built,which supported the use of I2C interface and RJ45 interface in hardware,and UATCP protocol stack was transplanted on the basis of Linux system in software to realize the communication between sensor and 828D CNC system.The experimental results show that using the bus bridge to communicate the underlying equipment with the CNC system is cross-platform and simple,making intelligent manufacturing possible.