A method and apparatus for a simulative hair design by using computer programming has at least one processing unit, at least one monitor, an image recording device and a permanent device. The at least one processing unit can help hair stylist to design a hairstyle and store customers' data so that the customer can know outcome of hairdo before the hair stylist cut, educate apprentices who study hair design, count storage of expendables for salons or barbershops. The at least one monitor can display image of hairstyle combined with the customer's head image. The image recording device can take image of the customer and stores into the at least one processing unit. The permanent device can receive argument of permanent from the at least one processing unit so that the customer' hair can have well permanent.