In the drilling process, problems such as Hole collapse, lost circulation as well as damage of oil and gas formation are often caused by lack of plugging performance, especially in high temperature and high pressure(HTHP) wells. The existing plugging property evaluation method has certain limitations in evaluating the plugging property of high temperature (200°C) and high pressure (10 MPa) drilling fluid. Therefore, a HTHP displacement method was established to evaluate HTHP plugging property of the drilling fluid plugging agent. The method simulates the stratum with sand-filled pipe, and drive the plugging agent base slurry or drilling fluid in the sand-filling pipe under different temperature and pressures conditions, which evaluated the plugging property according to the change of the permeability for the sand-filling pipe under different pressures and temperatures. LRF, LPF and LSF were selected for evaluation，and the LPF had best plugging property of three plugging agents at 3MPa and 200°C，as well as the LPF had best plugging property at 10MPa and 200°C, which was further verified by evaluation method of HTHP filtration loss and pressure transmission. The experimental results were consistent with the HTHP displacement method, and the newly established evaluation method for HTHP plugging property is feasible of drilling fluid plugging agents. The research results show that the established evaluation method can evaluate the plugging property of plugging agent and drilling fluid simply and effectively.