The purpose of this thesis to develop computer-assisted lessons teach the subject system of the human body. Now the steering system and the digestive system, with its ease of use to meet the learning needs of students in junior secondary layers. Which the Group achieved media teaching systems of human body. Based on the course teaching of high school students beginning to design a test program ready to use. The development tools Adobe Flash Professional to help in the matter of the CS6, and animation of a character that is used as the medium of learning, and the design and development of computer-assisted lessons teach the screen to work, each screen is comfort. Simple and easy steps to design applications that are created for each screen is designed to be easy to use and covers all of the lessons to learn of junior secondary students more efficiently.