"Collage technique" is joyful and playful technique for psychotherapy. Therefore, it have been practiced frequently in psychiatrical clinic for children in particular. With such practices, lots of fundamental researches of collage technique came to advanced too. However, to perform useful researches, researchers have to return to practice many times and examine a study design. In this atricle, therefore, I will describe and examine practice processes of collage technique in detail for a future study of collage technique.