Abstract: This paper describes the problems of clogging in geothermal reinjection wells in the Neogene sandstone aquifer based on geothermal reinjection tests.The clogging problem deals mainly with the characteristics of geological structure,such as sandstone,and design of the reinjection system.This paper also summaries and analyzes the causes of difference types of clogging,such as physical and chemical clogging,gas clogging,microorganism clogging,etc.The advanced techniques to prevente the clogging was also described.