Laser diode with narrow linewidth and high frequency stability is extremely important in many fields like high-resolution laser spectroscopy, atomic frequency standards, atmospheric and environmental monitoring, optical communications and so on. Therefore, research on frequency stabilization of laser diode is necessary and valuable. The frequency stabilization technologies which are wildly used for semiconductor laser at present are summarized. Their principles are simply given and frequency stability, advantages, disadvantages for every solution are fully analyzed. Finally, the possible development tendency of frequency stabilization technologies for semiconductor laser are presented.