Direct and mediating effects of homework worry anxiety on homework effort and homework achievement and the differences in the structural relations among homework motivation constructs and homework achievement across mathematics and English homework were examined in 268 tenth graders in China. Homework motivation included task value, homework self-efficacy, homework worry anxiety, and motivation application. Homework accomplishments were rated by mathematics and English teachers. Homework value had positive effects on homework effort and worry anxiety in both subjects. Homework self-efficacy had positive and negative effects on homework effort and worry, respectively. Homework worry mediated the relation of homework value to effort and to achievement; the relation was more prominent in mathematics than in English homework. The mediating effects of worry anxiety in the relation of self-efficacy to homework effort and to achievement were significant only in mathematics. The domain specificity and direct and mediating effects were discussed in the cultural and educational context.