Standardized class hours refer to the class hours formulated by the teaching management department and uniformly stipulated within a certain curriculum and curriculum content. The national intelligent education platform for vocational education is an online learning platform for vocational education students all over the country. Its courses and content categories are planned and managed by the national education administration department, so its credit algorithm is also calculated on the basis of standardized hours.

Compared with the standard class hours, flexible class hours have greater autonomy and flexibility in learning content, learning methods and class hours arrangement, so as to meet individual differentiated learning needs.