In accordance with the characteristic of north arid and semi-arid agriculture.The effectsof agriculture technique and water conservancy on increasement yield of agricultural production wascomprehensively analyzed.Meanwhile,according to the conditons of social and economic develop-ments of the irrigation district of Baoji gorge,Shaanxi province,before and after the region beginsbeing irrigated,long series method of analysing and calculating irrigation benefit fitting for actualcondition of the region was probed into.