Abstract: By statistical analyzing climate data at Nanjing station for 57 years,the results showed that low temperature and overcast in early spring from March to April affected the seedling and sprouting of watermelon.Flood,hail,gale that caused by plum rains from the middle June to the early July affected the early mature watermelon in picking period,and it also affected the mature,picking,and list of the mid-maturity watermelon.High temperature in midsummer and summer drought in July and August might cause water shortage and drought for late maturing melon field.According to various disaster weather(such as continuous rain,gale,rainstorm,drought and so on) that may affect watermelon growth,and combined with production practice,the countermeasures were put forward,such as,choosing construction watermelon plantation areas,reasonably arranging planting patterns and density,improving management levels,preparing for some defensive measures before disaster weather coming and so on.

Key words: Watermelon, Meteorological disaster, Defensive measures