The problem during the overall scheme of bidirectional fold implosion technology is the lack of calculation basis for selecting key parameters.Thus the quantitative design method of folding blasting plan is studied.Firstly,a multi-rigid body dynamic model of the building's motion posture is established.Based on the dynamic model and engineering case analysis,the design criteria for main parameters such as the position of the blasting incision,the sequence of initiation,and the delay time are put forward.It is proposed that there should be 2 to 3 blasting cuts,and the mass of each section should be close with a height-width ratio greater than 2.The opening directions of adjacent incisions should be opposite,and the bottom incision should face a spacious area.The initiation sequence of each incision should be from top to bottom with the minimum delay interval between adjacent incisions approximately equal to the time for the upper incision to rotate 1°~2° after initiation.While the maximum delay interval is equal to the time for the upper incision to close.Reasonable initiation delay time should ensure that the building is zigzag in the air before any blasting incision is closed. Through the blasting example of a 19-story building,the rationality of the design criteria and the kinematic model is verified.