Abstract: In order to meet the demands of building stone in Urumqi and surroundings during the west development,but also provide effective and reliable building stone resources for the land department in Urumqi,we carried out a geological survey in detail and mapped at a large scale in Qijiagou for a very purpose with the combination of the experts' view of geology,survey,security and other departments in Xinjiang.At the same time,we made a reasonable judgment to the terrain through the topographical map drawn by field measurements,thus we can determine the production security angle.Meanwhile,the samples were tested for the rock and mineral identification and compression so that we can determine the quality of stone in this area.According to the mining conditions and factors such as market demands in Xinjiang,we use the method of segment to calculate the ultimate resources.By taking the above methods and means,we determined the production security angle of 45° and confirmed that the andesites and basalts in this region were met the standard of the building stone.At last,we calculated the effective exploitation of reserves is 2000million cubic meters.