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Ultrasonic ranging is a non-contact and continuous measurement which is simple in circuitry and high in accuracy. The single-channel ranging system can't meet the requirements such as real-time, three-dimensional and diversity. This paper designs a multi-channel ultrasonic ranging system based on FPGA(Field Programmable Gate Array) which is produced by Capital Microelectronics and tests and processes the echo signal come from US_100.The system can realize distance measurement from 2 centimeter to 4.5 meters. And the results can be displayed on LCD (Liquid crystal display). All software modules are designed by using Verilog HDL in Primace editing environment, and verified on the Modelsim and HR3 FPGA platform. The test results show that this system is stable and highly accurate. 