It has been commonly assumed that language learning strategy training would improve language learning and should be included in foreign language instruction. However, few empirical studies have explored that effectiveness of strategy training in improving learners' target language learning. The effectiveness of strategy training on language learning is still not conclusive. This study evaluates a semester-long language learning strategy course in terms of its effect on the target language learning process. Moreover, the long-term effect of the training is examined. The study participants were 47 Taiwanese college students who were divided into an experimental group and a control group. The experimental group participants attended the language strategy training course, while the control group participants did not receive the strategy training. The main findings address the effectiveness of strategy training on students' target language learning in terms of their improvement in strategy use, the affective domain, and proficiency levels. Factors that might hinder students' strategy application are also identified. (Contains 40 references.) (Author/SM)