Abstract: A LD power supply for pumping the monolithic laser is developed and driven by constant current circuit.Software monitoring is applied to test and adjust long period stability and fault of current.Temperature adjustment arithmetic of fuzzy and proportional-integral-derivative(PID) control is used to gain small overshoot and high control precision.Basic PID arithmetic is simplified by using a subsection chosen value to improve the operation speed more than ten times.Continuously frequency adjustable laser is realized in a certain temperature range,whose current stability is less than 2mA,lasting temperature fluctuation is below 0.1℃.