[Abstract] Objective To explore the effect of mobile application program（APP）based internet platform improving formative assessment inside classroom in the undergraduate education of anesthesiology. Methods 195 students of department of Anesthesiology first received conventional method (control group) and then received APP based internet platform method (experimental group) to perform formative assessment inside classroom. The effect was evaluated and compared between these two groups by test and questionnaire. Result The time-consuming of class-room test and score analysis in experimental group were shorter than control group（1.2min/course hour＜18min//course hour，6min//course hour＜56min//course hour）. The attendance rate and score of test had no difference（98.3% vs 100%，17.2 vs 17.5）. The questionnaire survey showed students satisfied the new teaching method（98.5%） because of the convenience（100%）

objectivity（97.4%）

feasibility（98.5%）

less workload（100%）

enthusiasm stimulation（97.4%）

and better teaching effect（100%） in experimental group. Conclusion The mobile application program（APP）based internet platform is an convenient

accurate and objective method which has positive effects to improve formative assessment inside classroom in the undergraduate education of anesthesiology. It is a new teaching method worthy of promotion.