Abstract: Fold structure is one of geological factors affecting coal mining and controlling gas accumulation in Hancheng mining area. To investigate the geometry and geodynamic mechanism of buckle folds in Hancheng mining ar- ea is helpful for deepening the understanding on the geological structure development law and guiding coal mine pro- duction more effectively and safely. On the basis of geological analysis,the buckle folds of the research area is system- atically analyzed,using such methods as trend analysis,balanced section analysis,numerical inversion of paleotectonic stress-strain fields. The main research results are as follows:In Indosinian period the horizontal compressive tectonic stress from south resulted in anticlinorium in south area and synclinorium in north area as well as secondary buckle folds with the axial direction nearly EW,and the shrinking rate was larger in the south area. The horizontal compressive tectonic stress in Yanshan period was more intense than one in Indosinian period,which came from SE direction and formed Hancheng overturned anticline and secondary buckle folds within the mining area with the axial direction NE, and the shrinking rate was larger in the eastnorth area. Bedding slip structure and tectonic coal were common in north area due to the across superimposing of the folds formed in the two periods.