I have seen the Happy Mathematics CD 100 developed by Teacher Liu Wei, and listened to Teacher Liu Wei's patient and meticulous explanation of his junior high school learning process. First of all, I feel that this happy learning 100 home is like a caring teacher with a child. I feel that every chapter in it has been carefully reviewed after reading the introduction, which is very helpful for me, a smart child who doesn't want to spend energy studying. Although each chapter reviews some basic knowledge, you won't forget it if you master these basics. I think it is very good to improve children's interest in learning and interesting systematic incremental learning methods. Children also need self-confidence in learning. I also hope that my children can show their original enthusiasm in learning and improve their grades with the help of Liu Wei's learning method.