A certain type of missileborne accelerometer is the vulnerable spot that affects the storage life of the rocket control cabin.Considering that the statistical data of accelerometer is binomial and incompletewe used isotonic regressionvariable sample Pearson χ2 test of goodness of fit together with minimum χ2 estimationto solve the “reversal” problem of failure frequency.The distribution parameters were givenand Pearson test of goodness of fit was made to the distribution function.The result showed that:both I maximum distribution and Weibull distribution were suiand Weibull distribution was selected as the life distribution because the former one had no accelerating ability.In the endthe natural storage life under confidence level of 0.90 and reliability of 0.95 was obtained.The acceleration factor under 90 ℃ is 7.2695.Thus the Accelerated Life Time (ALT) of certain batches of accelerometer was obtained.The study is of engineering significance for ALT plan of and budget.