The ceremony took place on April 30 at Zhejiang University in Hangzhou, the People's Daily Online reports.
The university invited its alumni to return for a giant wedding ceremony paid for by the school.
The university conducted the ceremony as part of its school's 119th anniversary.
Aside from the 400 couples, around five thousand relatives of those who took their vows along with their former teachers and classmates were also in attendance.
The couples travelled from around 10 provinces of China along with countries such as the US, Germany and Japan.
Sofia, Phoenix, United States, about 5 hours ago
Here is wishing long and happy marriages to each and every couple!
Grahame, Haarlem, Netherlands, about 9 hours ago
China is becoming weirder and weirder by the day!
Pegaroo, None, United Kingdom, about 9 hours ago
mrsgreywillseeunow, Coventry, United Kingdom, about 9 hours ago
Really intimate and private between close family and friends then?????.... Absolute joke!!