At present, the penetration of wind power integration operation increases gradually. Using wind power to participate power grid frequency regulation and strengthen system operation stability is the research hot topic at home and abroad. This paper reviews the technology development for wind farm participating into power grid frequency regulation and contrastively analyzes different control strategies such as virtual inertia control, droop control, rotor speed control, pitch control and additional energy storage systems. The principle, pros and cons, and applicable range of various control strategies are stated. The coordination control algorithm among different wind turbines in a wind farm and the coordination control between wind turbines and other conventional generators are analyzed. The new thoughts brought by the application of intelligence algorithm and Virtual Synchronous Generator technology (VSG) and the challenges resulted from the application of Voltage Source Converter Based High Voltage Direct Current transmission (VSC-HVDC) in wind power frequency control are studied. Finally, this paper comes up with some key issues to be researched in the future:the impacts of source charge bilateral uncertainty on wind power frequency regulation, the parameters setting basis of wind power frequency modulation algorithms, and frequency regulation capacity evaluation method of wind power in systems.