It's fairly difficult from your major moving into accounting. During campus
recruiting, they will look at what accounting classes you've been taken or
will take. Big 4 recruits economic major students if your school is pretty
good.
US is a a bit different than China in this field. China big 4 recruits from
all type of majors as long as you are from a good school. US firms only
recruit from selected schools with good accounting majors.