Laser is now used in many fields of science researches

especially in laser spectroscopy

laser chemistry and isotope seperation. It is required precisly and characteristically for the lasers to operate with stable frequency

narrow spectrum range and continously regulated wavelengthes. We have succeeded in researching for and making out an active stabilized frequency ring dye laser.Its wavelength range is from 5700 to 6200A and can be regulated continously. The short-term stabilization of the laser frequency is no more than 1MHz and its long-term stabilization is less than 100MHz during one hour.The laser automatic scanning range is over 30 GHz without mode-hop. The main theory of stabilization of this kind of laser is based on a high precise interferometer used for detecting the variability of the laser frequency.Depending on three electronic control systems

we take feedback controls on several turnable elements for stabilizing frequency.This laser eletronic control system also uses an automatic locking method. This paper gives emphasis on the analysis about the technique of stable laser frequency control system.