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Accelerated failure time model Failure time and CO variable. Nonstandard accelerated life model, CO life cycle function The model is generalized to the general nonlinear functional relation. Robust weighted generalized M estimation for nonlinear regression Estimation coefficient and scale of generalized M type objective function Asymptotic properties with asymptotic properties include asymptotic consistency and asymptotic normality. Set up the evaluation index system, Simulationssuggestthatthe put forward Estimators with robust estimators