The authors focused on research and analysis of PET index and WRSI index for Tinh Gia and Quan Hoa districts from 1991–2000 for 3 rice crops and the summer–autumn crop of 3 other food crops. The results show that PET values move in a cycle: December and January are the lowest of the year, March – May the value increases, the value peaks in June – July, then decreases gradually from August to November. The value of PET is higher in Quan Hoa than in Tinh Gia. WRSI values of winter–spring rice crop in the districts range from severe to very severe drought; For summer–autumn rice crop, Quan Hoa district has mild drought index and no drought, higher than Tinh Gia in medium and mild drought; With the season rice crop, both districts have an average level of water demand satisfaction. For summer–autumn maize, peanut and soybean crops, while Quan Hoa meets the average drought demand, Tinh Gia district has severe drought and very severe drought. In each crop, yield value and WRSI tend to be proportional to each other, however, when WRSI fluctuates quite a lot from year to year, crop yield has only a slight variation.