Abstract: In?situ combustion, a kind of thermal production technology for generating heat within an oil zone, is also called fire flooding process. It is not only a method used to improve oil recovery factor, but also an effective approach to convert production methods in middle to late stages of oil field development. Laboratory experiments have proved that, the residual oil saturation in the combusted zones is almost zero, while the recovery factor can be as high as 85%~90%. In the implemented in?situ combustion projects on the field, the recovery factor can also be as high as 50%~80%. Based on the geologic characteristics and current development status of the heavy oil reservoirs in Karamay oilfield, this paper makes probe into the test effect of the technology applied in the heavy oil reservoir in Wellblock Hongqian?1 in Hongshanzui oilfield. On the basis of comprehensive evaluation, this technology is believed to be adaptable to development of heavy oils for EOR during late stage of cyclic steam stimulation