Abstract: The most prominent advantage of Concentrating Solar Power（CSP）technology over photovoltaic power and wind power generation technologies is its large-scale low-cost all-weather operation，by which it lower the power generation cost and improve the energy quality. In recent years，CaO/Ca（OH）2 chemical heat storage system stands out from numerous chemical heat storage technologies for its high heat-storage density，high reaction efficiency，high security and low cost.The research on CaO/Ca（OH）2 chemical heat storage system is reviewed from three aspects which are process mechanism，reactor equipment and system integration，so as to provide references for further optimization of the energy storage system.Firstly，the basic principles of heat storage/release of the system are introduced.Doping and granulation can effectively solve the sintering and agglomeration of solid reactants，but exert negative effects at the same time，such as side reactionproducts，dramatic decrease of heat storage density and low reacting cycle stability. The fixed bed reactor cannot run continuously，and is not suitable for industrial applications. The following research will focus on optimizing fluidized bed reactors and moving bed reactor

Key words: Concentrating Solar Power（CSP）, chemical heat storage, process mechanism, reactor, system integration, CaO/Ca（OH）2