disclosed is an image reconstruction method in a high - energy dual - energy ct system . the method comprises steps of scanning an objection with high - energy dual - energy rays to obtain high - energy dual - energy projection values , calculating projection values of base material coefficients corresponding to the dual - energy projection values on the basis of a pre - created lookup table or by analytically solving a set of equations , and obtaining an image of base material coefficient distribution based on the projection values of base material coefficients . the method provides a solution for reconstruction with high - energy dual energy ct technology and thus a more effective approach for substance identification and contraband inspection , thereby bringing a significant improvement on accuracy and efficiency in security inspection .