Abstract: The determination of the fracturing pressure of a heavy oil reservoir is of great value to the implementation of thermal recovery process.In view of such characteristics as low depth of burial, poor cementation and undercompaction, as well as the effects of many factors, such as tectonic stress etc.this paper analyzes, theoritically, the determination of the fracturing pressure of a formation and discusses the fracturing regimes, and then a method for the fracturing pressure and relevant parameter determination is established.This method is applied to determine the fracturing pressure of heavy oil reservoir in Qigu Formation(Jurassic)in District 9 of Karamay fields.The result shows that both horizontal fractures and vertical fractures are present at present steam injection pressure, which mainly account for steam channeling.It will also be helpful to the development of similar reservoirs in the future.