He has been a doctor for 45 years and devoted himself to the experimental and clinical research on the etiology, prevention and oral microbiology of dental caries. Great achievements have been made in the clinical treatment of endodontic diseases and won the praise of patients. 198/kloc-0 presided over the research project "investigation of streptococcus mutans serotype dental caries in dental plaque of school-age children in Shanghai" and won the third prize of major scientific and technological achievements in Shanghai; 1986 won the second prize of scientific and technological progress of the state education commission for the study of dental caries pathogens; And won the third prize of the Ministry of Health in 1995 "Study on the incidence and prevention mechanism of root caries in the elderly". Editor-in-chief of monographs: Oral Microbiology, Handbook of Stomatology, 2nd Edition, Shanghai Medical Nursing Routine-Oral Medicine Diagnosis and Treatment Routine, Series of Treatment by Famous Doctors-Dental Caries and Periodontal Diseases, Oral Biology and China Stomatology-Oral Microbiology. The deputy editor-in-chief has monographs such as Atlas of Practical Diagnosis and Treatment of Oral Diseases, Oral Self-care Series, and Modern Geriatric Stomatology. Since 1988, 1 1 doctors and postdocs have been trained. She has published more than ten academic papers on caries research. Academic exchanges were held at the 5th World Conference on Oral Prevention and the 4th Asian Conference on Oral Prevention. Professor Liu Zheng was awarded the titles of 1995 "advanced individual in national health system", 1997 "advanced individual in health care for cadres in Shanghai" and "model worker in Shanghai" in 2000, and enjoyed the special government allowance of 1992.