Turn eggs: The main usage of turning egg is to avoid the conglutination of embryos and egg film. The vitelline is lighter than albumen, the embryos is much lighter than vitelline. The embryo can touch the egg film easily, so we change the location of eggs by automatic egg turner system., and then the touch point of embryos and egg film changed. That can avoid the conglutination of embryos and egg film. The times of turning over: once every hour. After the 17th day, they do not need be turned, we can move the hatching egg to borning area of egg incubator