Frequency regulation auxiliary service is of great significance for maintaining the stability of the system frequency and ensuring the safe and reliable operation of the system. At present, the types of frequency regulation auxiliary service products in China are simple and fixed price settlement is mostly adopted, which is not conducive to the optimal allocation of frequency regulation resources. The product type, operation mode, price and settlement mechanism of the frequency regulation auxiliary service market in the three mature power markets of PJM in USA, the UK and Nordic are deeply studied, and the characteristics of the above three typical frequency regulation auxiliary service markets are compared and analyzed. On this basis, combined with the domestic actual situation, suggestions for the development of the domestic frequency regulation auxiliary service market are put forward, hoping to provide a useful reference for the construction of the domestic frequency regulation auxiliary service market.