The embedded platform based on ARM and FPGA of real-time controlling is an important method to intelligent and handy instruments. The kernel of the system design is to manage and control FPGA by ARM processor. The operate principle of data bus and GPIO is analyzed, and then changing data by data bus, changing state for FPGA is designed. The designs simplify the interface circuit. The drivers' principle and program technique is researched. The simplification programs of data bus and GPIO are designed to economized system resource. The application multi-data collection system with ARM+FPGA system is provided.