Abstract: The original gravity and magnetic data from two geologic profiles, south and north in Qiangtang petroleum geologic aisle, were processed by using the method, “gravity and magnetic apparent-depth filtering”, and the initialization characteristics of geologic-geophysical profile were extracted from the potential field abnormality in these profiles. And then, the latest software, “Gravity/Magnetic Modeling Software (GM-SYS)” , was used to inverse gravity and magnetic profile, the geologic fine structure profile plot and grid plot of the two geologic profiles were obtained under the restriction of the correlative seismic, geoelectric and geologic data. Primary analysis and explanation on several important geologic problems were made combining with the other materials in this aisle, more understood was got for the distribution of formation, basement, fracture and volcanic rocks in Qiangtang petroleum geologic aisle, and this provided some new evidences for the geologic explanation and hydrocarbon prospect evaluation of the whole Qiangtang Basin.

Key words: gravity and magnetic apparent-depth filtering, Gravity/Magnetic Modeling Sofware, interpretation section map and grid plot, Qiangtang Basin