The undergraduate course lasts for four years, and each year is divided into two semesters, each of which lasts for five months. Last semester starts from September to the following year 1 month, and next semester starts from March to July. In order to ensure the integrity of the academic system, the graduation time is probably set at the end of June or early July. In addition, considering the climatic factors, July and August are the periods with the highest temperature in our country. Vacation or graduation at this time can make students spend their summer holidays comfortably at home.