To solve the demands for high-speed real-time precision ranging in industrial field measurement， various high-speed and high-precision laser ranging systems have been designed and developed. The design of dual ruler frequency synchronously-modulated laser and dual signal synchronous detection improves the measurement speed of the system to meet the needs of high-speed ranging. The under-sampling method applied to the high-frequency signal phase detection has been analyzed and proved effectively， which considerably reduces the complexity of the phase detection processing circuit. The integrated high-speed laser ranging system， which uses 201 MHz+3 MHz dual rule-modulation laser source and a sampling frequency of 40 MHz， combining with optical transceiver system and signal solution circuit. The measurement speed and measurement accuracy of the laser ranging system were tested. The experimental results indicate that the measurement speed of the measurement system can reach 62 times/s， and the ranging accuracy can reach ±0.2 mm. The real-time measurement performance of the system with high speed and high accuracy is effectively verified， which can be used for high-speed ranging systems such as high-precision laser scanners and dynamic tracking measurement