The advancement of Artificial intelligence (AI) has a tremendous impact on society. Meanwhile, a variety of ethical issues (AI ethics) on different topics arising from AI have become increasingly serious. For solving AI ethics, ethics education is widely considered to play a very critical role. This study proposed a case-based educational approach to solve the AI ethics. The proposed method is evaluated by network　analysis，which can analyze text data of opinions to understand the changes of opinions. The results show that the experimentalists changed their views towards AI ethics to some extent after the case education.