Chickenpox is caused by varicella-zoster virus infection and is usually most severe in children on day 3-4. Chickenpox is a common infectious disease that is highly contagious and is mainly transmitted by respiratory droplets and direct contact with children and adolescents. The disease can first appear symptoms of infection, such as fever, decreased appetite, general malaise, etc.. The most serious stage of the disease is the rash and systemic infection, which can appear around the 3rd to 4th day, and is the most difficult for children. As chickenpox is a self-limiting disease, the rash will dry up in about 4 days, the new rash will gradually decrease and the disease will gradually recover. In addition, the patient should pay attention to bed rest during the illness, strengthen nutrition, and give timely antiviral and symptomatic support treatment, usually 7-10 days after the condition can gradually improve, to achieve the purpose of cure. At the same time, it is also necessary to pay attention to home isolation during the illness to avoid the transmission to normal children.