Abstract: To give scientific props for decisions on the quality of products and to improve the integral quality of products,taking mechanical product quality characteristic as the object of study,the dynamic characteristic of product quality in total life cycle is analyzed and the quality characteristic is divided into the technical quality characteristic and the descriptive quality characteristic from the measurable viewpoint.The scope and the weighting of the quality characteristic are determined with quality function deployment,extension analytic hierarchy process(AHP) and combinatorial weighted method.Then the two kinds of quality characteristics at various life cycle stages are analyzed and calculated by applying quality tools such as Taguchi quality loss model,"P-E" system,quality-cost model so that the total life cycle-based quality-driven product model is established.Finally,taking numerically-controlled machine tools as an example,the model and method proposed is verified,proving the effectiveness of the model.