Academic contingency of self-worth (ACSW) refers to the degree to which one’^{s sense of self-worth is based on academic achievement. Past research on this subject focused on the joint influence of ACSW and achievement (such as success and failure) on affective and motivational outcomes. However, the cumulative effects of past achievement have not been taken into consideration. This study examined how the interaction between ACSW and perceived cumulative achievement influenced motivation. The participants were 226 junior high school students. The results showed that when the self-report of cumulative achievement was high, ACSW enhanced the motivation.}