Objective To explore the implementation effect of moral field teaching in Nursing Ethics. Methods A total of 344 undergraduate nursing students from eight classes were selected by convenience sampling method, then class 1 and 2 were integrated and class 5 and 6 were integrated, totally 174 students were regarded as a control group, who were taught by using traditional case-based learning in Nursing Ethics;and class 3 and 4 were integrated and class 7 and 8 were integrated, totally 170 students were taken as an experimental group, who were taught by incorporating moral field teaching into case-based learning in Nursing Ethics. At the end of the course, the theoretical examination score of the two groups were compared, and the Chinese version of Moral Sensitivity Questionnaire for Nursing Students (MSQ-ST) and the Chinese Critical Thinking Disposition Inventory (CTDI-CV) were used to evaluate the teaching effect. Results After the teaching, in the experimental group, the theoretical examination score of Nursing Ethics, the scores of MSQ-ST and CTDI-CV were significantly higher than those in the control group（all P＜0.05）. Conclusion Incorporating moral field into teaching of Nursing Ethics can not only significantly improve nursing students′ theoretical examination score, but also enhance their moral sensitivity and cultivate their critical thinking ability, so as to help them analyze nursing ethics problem comprehensively and deeply.