Abstract: According to the field geology survey of northen section of Longmen mountain，the Qing Chuan~Mao Wen fault ，Bei Chuan~Ying Xiu fault and Ma Jiao Ba fault are used as the boundary，the mountain can be divided to back belt ，front belt and foothill belt.Combining the surface geology survey and comprehensive interpretation of seismic data，three structural units are divided in the subsurface of northen section of Longmen mountain，they are surface and shallow layer structural units，imbricate unit in subsurface and monocline unit in foothill belt.Based on the analysis of field survey and the drilling data in this area,it seems that there are several suits of source beds，reservoirs and cap rocks in the vertical direction in northen section of Longmen mountain.The thrust movement can provide dynamic force and trap for oil-gas migration，on the other hand，the overlay structural movement can also destroy the early oil-gas reservoir.Combining the affection of structural movement，oil-generating condition，reservoir condition and capping formation condition to the oil-gas aggregation in northen section of Long men mountain，it seems that，the imbricate unit of permain layer in subsurface is a favorable zone for oil-gas accumulation，the buried faults zone in foothill belt are the future exploitation direction in this area.

Key words: structural belt, structural pattern, thrust movement, exploration direction, northen section of Long men mountain