The purpose of this study was to explore the effects of achievement motivation on the selection of task difficulty, success-failure perception and success-failure attribution. Respondents included 98 subjects (66 males and 32 females) from Wu-feng Institute of Technology.The instruments administered to the subjects were three questionnaires-achievement motivation inventory, subjective success failure questionnaire and attribution questionnaire. The result revealed that there was no difference of task-difficulty selection between students with high-achievement motivation and those with low-achievement one. Secondly, a significant difference of subjective success-failure appeared between students with high-achievement motivation and those with low-achievement one. Thirdly, a significant difference of attribution to causes existed between students with high-achievement motivation and students with low-achievement one.