The difference between four years and three years of college:

1, different academic system: three-year academic system for junior college, with senior high school courses in the first year and higher vocational education in the last two years. The four-year academic system of junior college is a four-year system, with senior high school courses in the first two years and higher vocational education in the last two years.

2. Schools are different: the schools with three years' college education are ordinary middle schools, and the schools with four years' college education are key middle schools and higher vocational and technical colleges.

3. Different diplomas: three years after graduation from junior college, the diploma of secondary school will be printed at the provincial education department, and four years after graduation from junior college, it will be printed at the provincial education department.

Material supplement:

Full-time is an idiom, which refers to a classification of study time. Full-time education refers to a form in which students study at school all day or engage in learning most of the time within the learning period stipulated by the state. It is divided into full-time primary schools, junior high schools and senior high schools. Full-time undergraduate courses (also known as ordinary undergraduate courses) are usually accepted by national colleges and universities, independent enrollment or taking classes. The educational system is 4-5 years. Part-time undergraduate (also known as adult undergraduate) is divided into undergraduate education, self-taught undergraduate education, distance education, amateur education and open education that have passed the national unified entrance examination for adult colleges and universities.