As the optical source of the interfere nce measurement system,the semiconductor laser working condition has been influe nced seriously by the temperature.When the outside temperature changes,the outpu t wavelength of the semiconductor laser is changed,and the interference fringes come to be unclear,which greatly affects the interferometry.So the temperature c ontrol is important to the interferometric measurement.This paper,by using RC fi lter circuit and thermistor,proposes a different temperature detection method ba sed on phase recognition to control laser temperature real-timely from the conv entiional bridge.The second order filtering circuit is used to produce the high stability signal source and Verilog HDL is used to design counting module based on Quartus II development platform.The negative temperature coefficient (NTC) th ermistor is used as temperature measurement device and the semiconductor thermoe lectric cooler (TEC) is used as temperature control actuator to design a tempera ture control device for semiconductor lasers to improve the quality of the inter ference fringes.The experimental results show that whether heating control or co oling control,the system control response speed is faster,the temperature is con trolled at a certain level,and the temperature stability accuracy of the system can be 0.01℃.