Abstract: From autumn to winter of 2020, the precipitation had been relatively smaller in Ningbo City, Zhejiang Province. Various districts and counties had suffered from different degrees of drought. Based on the data of 63 national rainfall stations, the evaluation on the drought from autumn to winter of 2020 and the drought in the same period of the past years was evaluated by the methods of the continuous no-rain day and the precipitation anomaly. The monthly drying index and reservoir storage control ratio in autumn and winter of 2020 are analyzed and calculated based on historical data and compared with historical data in the same period. The results indicate that the drought from autumn to winter of 2020 is moderate drought, which is one of the most serious years in Ningbo City in the past 30 years. The combined evaluation method of the precipitation anomaly method can be reasonably used to evaluate the long-term drought. It's put forward that the monthly dryness index and storage control ratio of reservoirs can be used to predict the occurrence of drought.