His first and second feature I don't dare to tell you (1969) and At the runway's edge (1970) were both banned by Taiwanese government, especially the latter film contained homosexual overtones.
While at the Shaw Brothers, he would dabble in crime (Bank Busters), romance (Melody of Love), horror (Haunted Tales) and kung-fu (A Deadly Secret).
However, his most notable work for the Shaw Brothers would be Lost Souls (1980); telling the story of a group of illegal immigrants taken captive and sexually and physically abused by a gang of human traffickers, Lost Souls has often been called a brazen, vicious and outrageous exploitation film and a film that brings Pier Paolo Pasolini’s Salò, or the 120 Days of Sodom to mind.
One account, of how the Japanese military had performed every manner of horrific experiments on Chinese POWs and civilians while stationed at Unit 731 in Manchuria, particularly grabbed Mou.
After co-directing the hardcore pornographic film Trilogy of Lust with Julie Lee Wa-Yuet, Mou set about making a fourth sequel to Men Behind the Sun, this time visiting the 1937 Nanjing Massacre (or Rape of Nanjing) called Black Sun: The Nanking Massacre which released in 1995.