| The problem of resource,environment and population is the most important task which people have to face to nowadays. Because of the weak ecosystem,the geology disaster occur frequncy. people lived in this geology envionment suffer geolegy disaster at any moment, so their lives and possesstion often face threaten. Geology disaster as debris flow, landslide and landslip have characters such as outburst, strong destructive power, broad distribute area and hiddenness. Geology disaster mainly occur in mountains. Our country is a mountainous country. Among the geology disaster occurred in out country, debris flow occur frequence. it makes big losses in econemy construct and people live ,possession . so , it is necessary to reconnaissance, and study the form mechanism. To avoid the disaster we should evaluate the rock mass stability and propose efficient prevention and cure measure.Helong city is located in east mountainous area in jilin province. This border area city is mostly composted of korea. It is a state level indigent city with poor geology envionment. In rencent years , geology disaster such as debris flow occurred frequently . The occurrence of geology disaster not only deteriorated nature ecological environment, damnified people lives and possesstions, but also aggravated the indigent degree, influnced the society stabilization and confined the develop of national economy. For a example, the debris flow occurred in xing city in 2001 had destroied 1.4km2 farms, and had destroied the road. The direct economy loss is about 700,000 rmb.So , it is necessary to investigate the geology disaster as debris flow and landslip, and to propose prevention and cure method based on the investigation. It can help to solve the economy development, reduce the loss in geology disaster, strengthen the social stability, promote the protection of geology envionment and promote the harmony development of social economy. Through the analysis and evaluation of geology envionment in Helong city, we can evaluate engineering geology envionment quality, and divide envionmental geology disaster, offer scientific thereunder for the city development.The geology disaster point found in Helong city are about 106 places . There are about 69 places of debris flow, 27 places of landslip, 7 places of landslid, 2 places of ground collapse, 1 places of ground fissure. The mainly geology disaster in Helong are debris flow, landslip, and landslide. The debris flow mainly distributed in Cretacic sandrock and Archaeozoic metamorphic area in hilly region in the east town, Toudao town, Longcheng town, Fudong town.The landslide mainly distributed in Cretacic sandrock area in Helong city . The landslip mainly distributed along the road, railroad, and aroud the Yadong reservoir dam.The partition and evaluation of envionment geology disaster follows the principle as making the geology condition as the foundation, aggregate considering the develop density and scale of geology disaster, and adopting qualitative and quantitative method. Then, we use the 1:100,000 relief map as the bass map and split it with the method of grid data disposal. The standard unit area is 2km *2km. If some unit area is not got to 2km *2km because of the abnormity, please merger it to the adjacent unit. We consider the bigger than 2km *2km unit as a standard unit when evaluating. We incorporate units when their geology condition as same as each other. Using the method above, we apart the helong city into 53 rows and 33 lines, in all 1223 units. We use the unit gridding information synthesis evaluate method to ascertain every basic unit's stability index. Then, apart the area with the stability index, and describe every part, aggregate evaluate the geology disaster' occuring degree. The factor which affecting the geology disaster's occurrence and development in Helong city is various, as nature factors and man-made factors. Because of the affection of the geology envionment and engineering activity, it is often not the same between units of...
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