Paul Sun, it was the first secondary school located in Kwun Tong.

Paul Sun in 1958 in a villa on Kwun Tong Road, now the premise of St. Joseph's Anglo-Chinese Primary School (SJACPS).

In 2008, the school celebrated its Golden Jubilee, and in January 2011 moved to Jordan Valley New Campus.

In the academic year of 2017–18, the school celebrated its 60th Anniversary (Diamond Jubilee), whose celebrations included several open days and carnivals, facility upgrades, the Diamond Jubilee Walkathon, Brother Paul Sun's Memorial Rites, and several others, all with the theme of "Homecoming" - featuring alumni as the star of the theme.

Due to the packed frequency of events, the cancellation of the second term joint-test was required.