Abstract: Taking Metso C140 jaw crusher as a case， the laser level detection technology is adopted to design a matching sensor system. Two laser level meters are installed in the proper position above the crusher， which solves the problem of material level detection in the crushing chamber and the lower ore bin. Taking the crusher current and the level crushing chamber as control variables， the automatic feeding operation of Metso C140 jaw crusher is realized by adjusting the feeding speed and start-stop set of the heavy plate feeder and using adaptive control algorithm. After the three jaw crushing systems are automated，the number of operators is reduced from the original 14 to 5， and the operation content is changed from the original mechanical repetitive operation to simple regular inspection， which achieves the purpose of personnel optimization and labor intensity reduction of operators.The system fills the blank of automatic control of jaw crusher in underground mine and has a good popularizing value.

Key words: crusher, laser rangefinder, automation, adaptive control, iFiX software