Abstract: By using 3D seismic and drilling data, combined with regional tectonic evolution, Permian-Triassic tectonic characteristics in H area of Khroat basin were studied. The results indicated H area mainly experienced three developmental stages, strong tensile fracture trap Indosinian stageⅠ, return tension of Indosinian stageⅡand Himalayan thermal subsidence period. There were four distinct unconformable surfaces that was TriassicPermian, middle Triassic series-lower Triassic. Structural layer could be divided into Carboniferous, Permian, middle and lower Triassic. It was divided into two tectonic units which were southern slope and northern fault tectonic units. The tensile faults with NW, NWW, and NE strike, were well developed in the area. Tectonic styles were basement-involved, which were ‘collapsed comb', ‘Y', ‘Inverted Y' and ‘X' tectonic types.