Peoples' consumer conscious arise resulting in peoples' increasing expectation for medical service quality. Once the medical results were not as the patients' expectations, patients' complains arise. If hospitals did not deal well or even ignore their patients' complains, medical disputes could arise.This study reviewed literatures and interviewed experts to realize the factors causing medical disputes. Five phases of medical service are divided as: waiting for medical service, supplying medical service, finishing medical service, waiting for medicines, and leaving hospital. By summing up the factors causing the medical dispute, the concept of crisis management was applied to design diagnosis questionnaire for the sign of medical dispute (DQSMD) and a distribution chart about medical dispute system. Then, four levels of preventive sign for medical dispute are divided as: observation period, incubation period, warning period, and dangerous period. The distribution chart displays the trend of medical dispute about what phases of medical service that a hospital does not prepare enough.This study verified the DQSMD in two hospitals. The results showed that the DQSMD analysis was similar to the preventive situations for medical dispute of the hospitals after discussing with persons who handle medical dispute in the hospitals. Therefore, DQSMD of this study could be as references for hospitals to prevent medical dispute.