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In view of problem of bad precision in measurement of coal level of coal bunker by use of ultrasonic level meter, the paper introduced design of a radar level meter based on radar ranging principle. The meter takes surface radar probe as measurement unit which is reformed to be suitable for mine use, and combines with corresponding power supply module, CPU processing circuit, communication module and output module which meet with requirement of intrinsic safety, and realizes precise measurement for coal level of coal bunker. The test results validated feasibility of the meter.