Currently, the mortality rate of novel coronavirus is about 2.3% or 2.4% according to the confirmed cases, because the patients are more concentrated, so the mortality rate in the origin of the epidemic is much higher than outside areas. However, we should not relax our vigilance because of the low mortality rate, and we should pay more attention to it. But the overall data analysis, compared with H7N9, H5N1 and MERS, the death rate is relatively low, but of course a little higher than the ordinary influenza.