With the continuous promotion of the construction of new power systems, the proportion of new energy installations is increasing, the demand for ramping capability is growing, and the importance of flexible ramping capability for maintaining the stable operation of power systems is gradually becoming apparent. At present, there is still much room for improvement in theoretical research and market construction of ramping auxiliary service market in China, while the United States has more mature experience in the construction of ramping auxiliary service market. It is necessary to study and analyze the determination of ramping demand price curve, which is regarded as a key and complicated part of the climbing market construction and operation. Firstly, the basic concepts related to the demand price curve of the U.S. ramping auxiliary service market are introduced. Based on this, the methods of determining the demand price curves of the ramping auxiliary service market in California and Midwest power markets are analyzed in detail, and their differences are compared and analyzed. Finally, taking into account the market construction situation and demand in China, feasible suggestions for constructing the ramping auxiliary service market are proposed in terms of market construction, demand calculation and demand price curve setting.