Abstract: With the introduction of carbon peaking and carbon neutrality goals, the construction of a new type of power system centered around new energy sources is gradually advancing. In this context, energy storage can effectively address the issues of reliability and flexibility resulting from a high proportion of new energy sources. In the current electricity market mechanism, compared to traditional power generation units, the contribution of energy storage systems to the system is often challenging to assess accurately due to the limited energy storage capacity. To address this issue, firstly, there is an overview of the factors influencing the capacity credit of energy storage capacity and the methods used for calculating the capacity credit of energy storage capacity domestically and internationally. Then, the focus shifts to the uniqueness of assessing capacity credit in the synergy between energy storage and new energy sources. Additionally, the approaches taken by the United Kingdom and the United States in integrating energy storage into capacity markets and its participation with new energy sources are summarized. Building upon this foundation, when considering China's electricity market development, a discussion is conducted regarding the common challenges and difficulties faced by energy storage participation in the market. Relevant recommendations for promoting energy storage participation in the Chinese market are also presented for the future.