Based on the analysis of the differences of the geological conditions, the environmental characteristics of heat storage and hydrochemical type between Xi’an City and Xianyang City, the author of this paper made a comparative study on the clogging mechanism of pore-type heat storage tail water recharge in Xi’an and Xianyang by coupling methods such as the hydrogeochemical theoretical simulation(PHREEQC), indoor simulation experiment of blockage and field recharge test. The results of dynamic core displacement test show that the blockage rates in the Xi’an recharge simulation experiment were larger than that of Xianyang No. 1 Well under the same temperature. The comparison of chemical plugging and microorganism blockage in the two areas shows that there is a larger amount of iron in the water of Xi’an recharge well, and a lot of iron bacteria and iron minerals would be produced in the recharge process, while there is little impact on the water caused by iron minerals in Xianyang recharge well. Studies have shown that, in an open environment the Fe²⁺ in the groundwater and the O in the air occurs oxidation reaction, producing some precipi-tation of mineral such as Fe₂O₃ and Fe(OH)₃, etc. A blockage is caused after these gelatinous precipitate go into the geological strata. The experiment shows that the suitability of reinjection formation in the Xi’an Sanqiao recharge well is less than that of Xianyang NO. 1 recharge well, and the open recharge way of the Xi’an Sanqiao recharge well increases the chemical and microbiological clogging.