Abstract: Top-coal caving face end support is difficult, mainly due to the formation and stability of triangle roof plate with curve side at face end.Strengthening of the early crossheading roof support is the premise of forming completed and stabe triangle roof plate with curve side.Reveals the solution to the end support is to solve the relations between the "large structures" of triangle roof plate with curve side and the "small structure" of end support. Large structure and small structure is a structure with coordination and mutual relations,the stability of "large structures" is the key of the face end stability.