1. Aged 18-75 years old, 2. RT-PCR positive for 2019-nCoV or Confirmed lung involvement with chest imaging, 3. The clinical symptoms are slight, and there is no obvious manifestation of pneumonia (mild disease) or clinical symptoms such as fever and respiratory tract in imaging. The manifestation of pneumonia (common type) can be seen in imaging, 4. <=7 days since onset of the disease, 5. Willingness of study participant to accept randomization to any assigned treatment arm, 6. Must agree not to enroll in another study of an investigational agent prior to completion of Day 28 of study.

1. Aged 18-75 years old, 2. RT-PCR positive for 2019-nCoV or Confirmed lung involvement with chest imaging, 3. The clinical symptoms are slight, and there is no obvious manifestation of pneumonia (mild disease) or clinical symptoms such as fever and respiratory tract in imaging. The manifestation of pneumonia (common type) can be seen in imaging, 4. <=7 days since onset of the disease, 5. Willingness of study participant to accept randomization to any assigned treatment arm, 6. Must agree not to enroll in another study of an investigational agent prior to completion of Day 28 of study.