: Construction of heavy precipitation and disaster prevention capacity are important factors affecting the occurrence and development of flood. On the basis of the daily precipitation data from 13 national meteorological observation stations in Zunyi City from 1984 to 2019 and the first national natural disaster risk census data of torrential rain and flood, I statistically analyzed the change characteristics of heavy rainfall, torrential rain, crop flood-affected area, disaster area and disaster frequency in Zunyi City. Furthermore, I made an in-depth analysis of the causes of the change of flood-affected area, disaster area and disaster frequency from heavy rainfall, torrential rain and social factors. The result demonstrated that heavy rainfall and its accumulated precipitation have shown a fluctuating trend of increase over the past 36 years in Zunyi City, while torrential rain and its accumulated precipitation have shown a significant trend of decrease. The area affected by heavy rainfall and flood and disaster area showed a fluctuating trend of rising first and then descending. The frequency of torrential rain and flood disasters showed a significant trend of increase. The number of days of heavy rainfall and its accumulated precipitation, the number of days of torrential rain and its accumulated precipitation were significantly and positively correlated with the frequency of crop disasters and the affected area. The relationship between heavy rainfall, torrential rain and affected area and disaster area has obvious inter-decadal and stage differences. To sum up, the occurrence and development of heavy rainfall and flood disasters are influenced by both meteorological and social factors, which are closely related to meteorological catastrophic weather forecasting and warning. Therefore, it is of critial significance to strengthen and improve the emergency response mechanism of catastrophic weather. Keywords: Torrential Rain and Flood, Affected area, Influencing Factors, Emergency Response Mechanism, Zunyi City