Abstract: The relational expression between fracture extension pressure gradient and pressure coefficient of fractured formation is matched based on fracturing operation data of 38 wells in Shanshan oilfield of Xinjiang.Field application results show that it is simple and reliable.In fracturing design for a new oilfield,the fracture extension pressure can be calculated by this relational expression since there is no fracturing operation data for reference.The surface equipment,downho1e tools and operation parameters for fracturing can be selected according to the operation pump pressure and power consumption.It plays an important role for scientific fracturing design.