Film is “a sequence of photographs projected onto a screen rapidly enough to create the illusion of movement and continuity” (The Free Dictionary). In modern society, people watch movies because they are one of their favorite leisure activities. With the development of the film industry, more and more film genres appear. There are approximately 10 major film genres. They include action, adventure, comedy, drama, historical, horror, musical, science fiction, war and western. Each type of film will have its own distinctive characteristics to allow people to distinguish it from others. Action movies usually have a lot of non-stop movement and physical stunts. Adopt the technique of battles, fights or escapes to show the motif of the films. And it usually includes two types of characters: one for good people and one for bad people, so sometimes this kind of movie contains heroism. Action film usually shown with violence and danger, but behind these it also shows love and ambition. Once Upon a Time in China and The Killer are both action films, the sound, lighting, camera technique and editing have some similarities. Once Upon a Time in China is about Chinese national hero Huang Feihong how to protect his family and country. Huang Feihong was born in Guangzhou at the end of the Qing Dynasty. At that time, China was being bullied by other Western countries. Huang is the leader of Po Chi Lam and the trainer of the civilian corps, he often teaches people Kung-Fu and expects that people can use it to protect themselves and the country. The Killer is about a story between the professional killer and the cop. Zhou is a professional killer but is not as cold-blooded as other assassins. Once, while performing a task, he accidentally damaged a singer's eyes. During the singer's protection period, the policeman knew that Zhou was a responsible and understanding person. Hence their relationship