The relationships between achievement-related motives, causal attributions, and affections and expectancy were examined using 80 male and 80 female undergraduate students. Subjects were administered the ARM Scale in the first session. At least three weeks later, a pair of subjects of the opposite sexes was asked to performe a block-design test under a competitive situation, to attribute their own outcome to four causal factors, and to judge their affects and expectancy. Variable causal attributions were more dominant in success than in failure, while the internal and stable causal attribution was more dominant in failure than in success. Some results from the correlations between the causal attributions and the affects and expectancy supported Weiner's hypothesis, but other results did not. To explore further the relative influence of achievement-related motives on causal attribution, affects, and expectancy, multiple regression analyses were applied. The analyses showed influences of some of achivement-related motives on these variables.