Conducting a research of public health has always been my goal. In my study at Duke Kunshan Unviersity, I have participated in lots of research to gain experiences. However, after started the SW project, I still met several problems. Fortunately, under the guidance of my mentors, I successfully solved the problems, and further improved my research skills. The current study aims to investigate the change in the prevalence of HAI through the COVID-19 pandemic and provide possible suggestions to future HAI control.