Is there a connection between Sinovac vaccine and leukemia? As the new coronavirus epidemic rages on, the Sinovac vaccine has become one of the hot topics on the Internet. Recently, some articles claimed that the Sinovac vaccine can cause leukemia, lymphoma and other malignant tumors. But is this statement credible? This will be analyzed below from four aspects: virus prevention and control, scientific verification, actual situation, and policies and regulations. Virus Prevention and Control The COVID-19 epidemic is the fastest-spreading and most infected public health emergency in the world in recent years. In order to solve the epidemic, many scientific research institutions have invested a lot of manpower, material and financial resources in research. Among them, Sinovac became