Language acquisition has a close relationship with learners' individual characteristics. The purpose of this study is to investigate the learning motivation and effort of technical students in learning business English. How they affect learning proficiency, and how all of them correlate with each other.The results of this study are as follows. Females' learning attitudes are significantly superior to males'. There is a significant correlation between attitude and proficiency. Also, it exists between motivation and proficiency. The interaction effects among learning attitude, motivation and effort on proficiency are insignificant. The attitude, motivation and effort in combination accounts for 19.5% of the variance of proficiency. But, the predictor, ”motivation,” explains the most variance of proficiency, followed by ”attitude.” The conclusion is that the most effective method to obtain higher proficiency in business English learning is to increase students' motivation.