Traditional FMECA (Failure Mode Effect and Criticality Analysis) method is used to analyze the macro-failure mode effect and criticality. And the micro-failure mechanism and the rule of evolution of the weaponry conditions rarely involved. So it is difficult to adapt to the application demands of Health Management System for Weaponry. The deficiency of traditional and improved FMECA is analyzed and FMECA method of Health Management-Oriented is proposed in the text. By analyzing the launching and controlling system of vehicle antitank missile in the new FMECA method, showing that this method is applicable and reasonable.