Based on the logging data of the drilled holes, analysis and calculation were made on the formation pore pressure, formation fracture pressure and borehole collapsing pressure in main blocks of the Hailaer oilfield; the sectional drawing was also established for pressure change of wells in different blocks and pressure change of wells in the same block but with different depth. According to the analysis, accurate predictive value of formation pressure could be obtained by acoustic time difference method. The fracture pressure was calculated by Eaton mode, Steve mode, Huangrongzun mode and well log data; the comparison proved the predictive data of fracture pressure by Huangrongzun mode was accurate and the collapsing pressure calculated by Mohr-Column rule could satisfy the project precision requirement. Reasonable and safe drilling mud destiny window was eventually determined for different blocks by comprehensive consideration.