Abstract: The present invention relates to a replacing method of an object in a dynamic image, wherein the dynamic image is a dynamic image file or a real time dynamic image. The replacing method of the present invention is to replace an object of the dynamic image by using a program, wherein the program comprises the first database, the second database, and a user interface. Saved contents of the first database are plural characteristics of the first object which will be replaced, in the dynamic image. Saved content of the second database is the second object, which will be used to replace the first object. When the dynamic image is showed, the program of the present invention will start to detect the first objects, which are in the dynamic image, by using the plural characteristics of the first objects and will start to proceed an object characteristic comparing procedure.