Abstract: With the development of my country's network technology and the transformation of education and teaching concepts, an unprecedented wave of online teaching has been set off in China, and the school's teaching mode has also shown the characteristics of "online and offline hybrid" "two-line teaching". This paper faces three vocational colleges in Suzhou,to evaluate comprehensively the teaching quality of online teaching from the perspective of students,through implementing “students' online teaching perception and evaluation questionnaire survey”, and Summarize the online teaching practice of Suzhou Vocational Colleges, In addition to consider the practice process and the result.We hope that this study will promote the quality of online teaching continuously, at the same time connect the online teaching and offline teaching effectively, and improve the teachers' online teaching ability. Finally,it also aims to provide guideline and reference to the class teaching reformation of the vocational colleges.

Key words: Online teaching, The quality of teaching, Student perception and evaluation, Vocational colleges