In view of the problem that the current evaluation of the survivability of weapons and equipment is mainly statistical and lacks physical support, in order to establish the transmission relationship between the structural parameters and the protective performance of each component, the concept of invulnerability was proposed, and the invulnerability analysis method based on the limit damage and the invulnerability characterization method based on the generalized protection time were proposed. And through the index to the quantitative mechanism of combat missions, the task-oriented invulnerability evaluation method was proposed. Driving performance invulnerability was studied as an example. Results show that:the invulnerability analysis method based on the limit damage can realize the construction of physical transfer relation from physical space to performance space; the invulnerability characterization method based on the generalized protection time can reflect the comprehensive influence of amplitude distance and difficulty degree on invulnerability; the task-oriented invulnerability evaluation method can introduce operational mission requirements into invulnerability evaluation and reduce the influence of subjective weight assignment on evaluation results. Case analysis verify the feasibility and effectiveness of the proposed method.