Abstract:Objective：To increase the excellent and good rate of pathological paraffin sections by PDCA（Plan，Do，Check，Action）circulation. Methods：The quality of paraffin sections was continuously improved by PDCA circulation method..A total of 2 820 paraffin pathological sections from January to June before PDCA improvement were collected in Jiangsu Province Official Hospital in 2019，and a total of 3 360 paraffin pathological sections from July to December after PDCA improvement were collected as research objects. The basic data were analyzed and the section quality before and after PDCA circulation method was observed. Results：Before the implementation of PDCA improvement，the excellent and good rate of 2 820 cases was 92.34%. After the implementation of PDCA improvement，the excellent and good rate of 3360 slices from July to December in 2019 was 97.35%.After the implementation of PDCA circulation method，the slice quality was significantly higher than before the implementation. Conclusion：PDCA circulation method can effectively reduce the incidence of poor quality of pathological paraffin sections，which is worthy of further promotion and application in clinic.