Immunogenicity and Safety of 2 Doses of Live Attenuated Varicella Vaccine

Inclusion Criteria: * Parent/legal acceptable representative is willing and able to understand the protocol requirements and provide informed consent * Participant is aged ≥ 1 year to ≤ 7 years * Participant without preventive inoculation of varicella vaccine and previous history of chickenpox and zoster * Subject and parent/guardian able to attend all scheduled visits and comply with all trial procedures * Body temperature ≤ 37.5℃ Exclusion Criteria: * Known allergy to any constituent of the vaccine * Known acute illness, severe chronic disease, acute exacerbation of chronic disease and fever * Known or suspected impairment of immunologic function, or receipt of immunosuppressive therapy or immunoglobulin since birth * Reported the history of allergies, convulsions, epilepsy, mental illness and brain disease and clear serious systemic reaction * Failed to the Expanded Programme on Immunization(EPI) * Receipt of any vaccine in the 4 weeks preceding the trial vaccination * Plan to receive any vaccine in the 4 weeks following the trial vaccination * Known bleeding disorder * Receipt of whole blood, blood plasma or immunoglobulin in the 5 months preceding the trial vaccination * Reported the history of acute illness had need systemic antibiotics or antiviral treatment of infections in the 7 days preceding the trial vaccination * An acute illness with or without fever (temperature ≥ 38.0℃) in the 3 days preceding enrollment in the trial * Participation in any other interventional clinical trial * Any condition which, in the opinion of the investigator, would pose a health risk to the subject or interfere with the vaccine