Abstract: Converting solar energy into chemical products is an effective way to achieve large-scale and continuous utilization of solar energy. The collectors and reactors are core equipment of solar thermochemical conversion systems. Based on the thermochemical reaction temperatures,this paper firstly introduced the typical solar thermochemical conversion systems in the low,middle and high temperatures,and the concentrators used in those systems are summarized. At the same time,the advantages/disadvantages and the development trends of different solar thermochemical conversion systems are briefly reviewed. Then,based on the heat transfer mode between solar energy and reactants,the following aspects of direct and indirect radiation heating thermochemical reactors are described Containing of types,structures,working principles and research progress.