Abstract: Based on the need to improve the detection efficiency, accuracy and traceability of the launcher tank sheets, the researchers designed a set of tank sheets thickness laser detection system. To solve the problem that the system error is too large to meet the measurement accuracy requirements, which encountered in the development process, noise filtering, data reduction, calibration compensation, data regression, inclination compensation and some other data processing or compensation methods were used. These tools overcame the adverse effects caused by factors such as sensor reading error, work piece deflection error, sensor spacing error, etc. By comparing data with the result measured by ultrasonic thickness gauge, system accuracy has been proven to meet usage requirements, with the maximum error is 0.03 mm.