Homework is considered as a substantial process of learning especially for engineering education. However, due to the fast development of network technology, students now can easily find solution manuals on the internet. While some students use solution manuals to study, there are quite a few students who just copy homework solutions and lose opportunities to learn. This paper proposes a self-assessment based homework model. In addition to finishing homework students need to correct their homework by using solutions and assess their performance using autopsies designed by the instructor. To test the efficiency of this model, an experimental study was carried out in "Control of Mechanical System" class with an enrollment of 39 students at California State University, Los Angeles. The results suggest that the proposed homework assignment model is effective.