According to the "National Postgraduate Entrance Examination Rules" issued by the Examination Center of the Ministry of Education, calculators are not allowed to be used in the postgraduate mathematics entrance examination. Mathematics examination mainly examines the examinee's basic knowledge of mathematics, analytical ability and problem-solving ability, and calculator is not a necessary tool. Candidates need to solve problems through manual calculation and reasoning, which is also one of the requirements of the postgraduate mathematics exam.