Abstract: To meet the requirements of accelerated life test design and evaluation suitable for engineering applications, the software ALT511 has been developed by Beijing Institute of Spacecraft Environment Engineering (BISEE). One of the four basic modules of the software is single stress & one stress level, which includes input, acceleration factor calculation, degradation modeling and reliability evaluation tabs. Based on five acceleration models including Arrhenius, inverse power law, generalized Erying, Norris-Landzberg and linear models, and the related acceleration factor calculation formulas, the methods for calculating test time magnification factor and accelerated life test duration were proposed. The methods for degradation modeling and calculation of pseudo life of non-failure test pieces were given. The distribution fitting of test results, the reliability point estimation and the reliability lower limit estimation were converted to normal stress condition and described. Finally, a software application case was presented for the accelerated life test on spacecraft bearings. The proposed software integrates proven acceleration models, test methods, authoritative standards and expertise, with both universality and industry characteristics.