Abstract: In order to realize the high precision and autonomous measurement of the roadheader, a laser position and attitude measurement system based on laser measurement technology is established to study the accuracy of the course angle of the roadheader. The composition and working principle of the measuring system are introduced. According to the error transfer theory and the course angle solving mathematical model, the course angle error transfer equation is established and the MATLAB is used to carry out the simulation analysis of measuring process. And the analysis results show that the course angle measurement error of experimental simulation and practical theoretical study is basically the same, and this measurement system is the highest accuracy in the current various types of roadheader positioning and orientation method, which fully satisfies the requirements of the course angle of roadheader in current production of coal mines.