Abstract: Based on study of the features of heavy mineral assemblage and the variation characteristics of stability factor of Jurassic in Bohu depression,this area was di-vided into several sedimentary zones and the parent rock properties and the rock types in each sedimentary zone were recovered,thus the sources of sediment s of each sedimentary zone were determined.There existed two main sediment source systems and two correspondingpalaeo-current systems in the original basin and the o-riginal basin was in an extensional environment of north-south trend.