The motive power of vocational school development first roots from development direction and needs of society, and second from the institutions’ self audit and professional assessment by the state. The two aspects of its development momentum play a vital role. The purpose of professional assessment is both to ensure the healthy development of dominant professions but also improve the insufficient of inferior professions, which has promotion action on the overall training level of institutions and social impact. This paper studies the professional assessment of vocational school, by describing the meaning and importance of evaluation index system, uses the fuzzy mathematics theory to quantify the various indicators, establishes the comprehensive evaluation model, and analyzes the quantization factor of each index. The results show that professional setup has comparative advantages in all the factors, the second is quality and efficiency, and the third is teaching reform situation.