The reservoir in Lungu 7 well field in Tarim Oilfield belongs to middle to high porosity and middle to high permeability reservoir. In order to research some of those damage factors in the process of mining, based on the rock properties and mineral composition characteristics, the sensitivity test evaluation method is applied to analyze the sensitivity damage mechanism of Triassic reservoir in Lungu 7 well field. The result shows that velocity sensitive damage does not necessarily exist in the middle-high porosity and permeability reservoir with high content of kaolinite. The velocity sensitive damage caused by kaolinite which is outputed by feldspar dissolution and limited in particle feldspar is smaller, but the alkali sensitive damage is larger. Illite which outputs on the clastic particle surface in the form of capsule has a little velocity sensitive damage. illite-smectite mixed-layer with a slice of pore filling type output mainly causes water sensitivity effect. It is considered that Triassic reservoir in Lungu 7 well field has the characteristics ofmedium-strong alkali sensitivity, mediumwater sensitivity, mediumweak dilute sensitivity and no velocity sensitivity.