Abstract：Based on geological setting, deposit condition, process and intention of geothermal, reinjection test in Tianjin is introduced and divided into several phases.Also the relation between water-absorbing capacity and temperature, pressure and reinjection mode are investigated while the change of geological condition under reinjection.Then the problems and long term potential are analyzed.Reinjection is a effective measure of thermal resources cyclic utilization and useful for prolonging geothermal exploitation longevity and improving living environment.It is shown that geothermal reinjection is feasible in Tianjin.

Keyword：geothermal reinjection;test process;process and intention of geothermal;