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Dagangshan hydraulic key project is located at middle reache of Daduhe River, In the boundary of the Shimian county of the west Sichuan Province.The river area which is dominated by the dam is 6.27 ten thousand km2, which passesss 81% of the complete flow domain, many years the average stream flow of Many years makes an appointment with 1000m3/s,water level of preliminary designed of the power station is 1130m, The huge dam stores water whch high 180m -190m, The largesttest altitude is about 210m, General storage capacity is about 7.42 hundred million m3,the Installed capacity of the power station is 2400MW, the existing research suggested that the terrain of the Reservoir slope is complex, the geological structure action is obvious,the weathering action and unloading action is intense,Hence,investing the stability degree of the rock mass of the reservoir reasonable rating of quality and ration is necessary,and which can supply the forceful foundation of guard.Taking aim of stability analysis and assessment of surrounding rock mass of the Dagangshan reservoir slope .In the condition of thouroghli investing the geology ambient,clarifying the compostiong feature and distribution feature of the reservoir rock slope,establishing the deformed damage mechanism together with evolution pattern of the rock mass, Based on the physics mechanics experiment of rock mass, The modified CSMR are adopted to perform the classification of the slope rock mass, On the basis of these, geologic methods and extenics theory are applied to analyze and compute the overall stability of the high slope. The block theory is used to evaluate the local stability of the high slope.The main achievements are obtained as follows in the paper:(l)The deformation mechanism of the rock slope is mainly consisted of bending and fracturing and sliding-fracturing.the damage Mechanism is mainly consisted of plane sliding,falls,topples and wedge shape sliding.(2) The modified CSMR are adopted to perform the classification of the slope rock mass,the quality rank of which is mainly II grade,the most part is between stable and foundational stable,merely part which was affected by structure action was low,which belong to III grade,else IV、V grade is exceedingly little.(3) Synthetically considering the different analysis fruit,the reservoir slope can be divided into 3 parts, (1)Wajiao-Tianwan river mouth,canyon rock slpe,the stability of which is very high; Tianwan river mouth ~Shaba,mixed slope of rock and soil,the most part is stable,the proportion of low stable is very little; (3) Shaba-reservoir tail,most part is soil slope,the stability is relatively
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