第一学期结束以后应该就可以了。。

Are you in USA university now Students usually take general courses in the first two years. The university will ask you to declare your major when you reach junior status. However, knowing your major early will help you plan a proper course of study and possibly save you time and money.I am taking IUB's kelley school of business as an example:2010–2011 Admission RequirementsCompletion of 26–70 hours of college coursework. (For transfer students, this includes completion of at least one semester on the Bloomington campus.) Consistent “B” performance across all courses. Please note that a B– does not meet this requirement. The Admissions Committee reviews grades in all courses, not just business courses. Completion of ENG-W 131 Elementary Composition * Completion of three or more of the following admissions courses: MATH-M 118 Finite Mathematics * MATH-M 119 Brief Survey of Calculus * BUS-K 201 The Computer in Business BUS-X 100 Introduction to Business Administration OR BUS-G 100 Business in the Information Age From the information above, I suggest you check the admission requirement for your dreaming school to get the creect answer.I think you can apply to transfer to another major after one semester's study, but before that you should take some proper courses.Good Luck.Ms Lu