Under the guidance of needs analysis theory, this research attempts to evaluate the validity of the existing Business English curriculum of a provincial level university by identifying and analyzing the needs of Business English undergraduates, graduates as well as their employers and Business English teachers. Both quantitative and qualitative methods are used. In addition, a four-year longitude study on the improvement of English proficiency was conducted among Business English students and traditional English majors. TEM-4 and TEM-8 were used to benchmark the change of English proficiency. The results, though gained from the case study on one university, may shed light on the evaluation and improvement of the Business English curriculum design of other universities of same academic level.