Chloroquine phosphate is effective in the treatment of neocrown pneumonia. Chloroquine phosphate has not only broad-spectrum antiviral effects, but also immunomodulatory effects. At present, after clinical application of chloroquine phosphate, the drug is considered to be effective in the treatment of neocrown pneumonia, regardless of the rate of resuscitation, the phenomenon of fever reduction, or the time of lung image improvement, the time and rate of viral nucleic acid conversion, as well as the shortening of the duration of the disease and a series of indicators for systematic and comprehensive evaluation. And no drug-related, apparently serious adverse reactions have been found so far in patients using the drug.