Abstract： Objective： Based on the methods of statistical analysis， data mining and retrospective study，the medical records of Prof. SHEN Li in treating gastric cancer were studied；the pathogenesis and treatment methods of gastric cancer were explored， and the medication rules of Prof. SHEN in treating gastric cancer were summarized. Methods：The clinical data of all gastric cancer patients treated by Prof. SHEN in the outpatient department of Ningbo No.2 Hospital from September 1，2018 to August 31，2021 were collected. The obtained data were input into the prescription database established in Microsoft Excel， and all the prescription drugs and effects conforming to the standards were input. The SPSS19.0 statistical software and the cloud platform of ancient and modern medical records were used to analyze the frequency of flavors， natures and effects， and cluster analysis and complex network analysis were conducted for high- frequency drugs. Results： A total of 1，213 prescriptions involving 115 kinds of Chinese medicinals were obtained. The total frequency of herbal use was 18，793 times，and the frequency of herbal use over 50% were 10 kinds of Chinese medicinals， which were Lycii Fructus， Taxus wallichiana var. Mairei， Glycyrrhizae Praeparata Radix et Rhizoma cum Melle， fried Crataegi Fructus， Rhizoma seu Herba Gynostemmatis Pentaphylli， fried Oryzae Fructus Germinatus， Citri Sarcodactylis Fructus， fried Hordei Fructus Germinatus，Cynanchi Paniculati Radix et Rhizoma and Actinidia valvata Dunn. The natures of the herbs were mainly mild and warm；the flavors were mainly sweet，bitter and acrid，and the main channel entries were into the spleen，stomach，liver and lung. The effects of the herbs were mainly to supplement deficiency ， clear heat and resolve toxin ， and promote digestion. After cluster analysis ， 9 clustering prescriptions were obtained. Through complex network analysis， the core prescription was composed of Taxus wallichiana var. Mairei， Glycyrrhizae Praeparata Radix et Rhizoma cum Melle， Lycii Fructus， fried Crataegi Fructus，Rhizoma seu Herba Gynostemmatis Pentaphylli，fried Oryzae Fructus Germinatus，fried Herba Ephedrae， Cynanchi Paniculati Radix et Rhizoma， Scutellariae Barbatae Herba， Hedyotis Diffusae Herba， Actinidia valvata Dunn， Fructus Citri Sarcodactylis and Actinidia arguta (Sieb. & Zucc) Planch. ex Miq. Conclusion： When Prof. SHEN treats gastric cancer， he mainly focuses on supplementing deficiency， clearing heat and resolving toxin， and promoting digestion as well as relieving symptoms， which complement each other and treat the root and branch simultaneously.