In order to realize the automatic measurement of laser transmitting angle of the dual laser source location system, we established a laser transmitting angle initialization system based on ultrasonic distance measurement. The system finished the automatic measurement of the system initialization angle by adopting the work style of main and secondary stations, using the triangle location principle and carrying out laser-led ultrasound to measure base lines and bilateral distances. At the same time, by adding the concerned algorithma as time delay compensation, temperature compensation and height compensation, in the measurement range of 20 m, ultrasonic measurement error is less than 2 cm, the laser angle initialization error is less than 0.05°.