Abstract: Objective To understand the incidence pattern of communicable diseases in class A and B in Fengtai district of Beijing from 1989 to 2016. Methods The estimated annual percentage change was calculated to describe the changes in morbidity and mortality rates of the communicable diseases over time,and correlation analysis was conducted to assess the trends of morbidity and mortality between the communicable diseases under consecutive surveillance and all the communicable diseases in class A and B. Results From 1989 to 2016,the morbidity rate of communicable diseases in class A and B in Fengtai decreased from 778.43/100 000 to 170.91/100 000. Intestinal infectious infections were the major diseases and the proportion of respiratory infectious diseases increased. The morbidity rate of AIDS increased from 0.26/100 000 to 5.77/100 000,while the morbidity of syphilis increased from 0.14/100 000 to 18.24/100 000. The morbidity of pulmonary tuberculosis ranked 2^nd from 4^th and the morbidity of syphilis ranked 3^rd from 5^th. The morbidity and mortality of the communicable diseases under consecutive surveillance were similar to those of all the communicable diseases (morbidity:r=0.989,P=0.000;mortality:r=0.924,P=0.000). The first three leading causes of deaths were viral hepatitis,pulmonary tuberculosis and AIDS. From 2004 to 2016,the crude mortality rate of the communicable diseases in class A and B increased from 0.59/100 000 to 1.59/100 000,while the standardized mortality rate decreased from 0.75/100 000 to 0.54/100 000. Conclusion The overall morbidity rate of communicable diseases in Class A and B decrease decreased in Fengtai during this period. The average annual mortality rate of the communicable diseases under consecutive surveillance increased more obviously compared with that of all the communicable diseases. Bacterial dysentery,pulmonary tuberculosis,AIDS and syphilis were the major diseases,to which much attention should be paid.