PSC (Putonghua Proficiency Test) is an oral test of the standard level of candidates' use of Putonghua. All the examination contents are given orally. Putonghua level is divided into three levels and six levels, namely, one, two and three levels, and each level is divided into two levels: A and B; The first grade is the highest and the third grade is the lowest. Putonghua proficiency test is not an evaluation of eloquence, but a test and evaluation of the standard level of candidates' mastery and application of Putonghua, which is a standardized Chinese proficiency test for candidates. The standardization of pronunciation, vocabulary and grammar shown by candidates in the process of using spoken Mandarin is an important basis for evaluating their level.