Abstract: Based on meteorological data from 1960 to 2010 at Shange Weather Station in Maoming, the change trend of climatic factors and climate productivity of Maoming City was analyzed. Results show that the temperature and rainfall had an increasing trend, but the sunshine hours slowly decreased. Climate productivity of Maoming increased at the rate of 21.3 kg/(hm²·a) was related to the climatic factors. The correlation coeffcient with annual average temperature reached 0.99, which was obviously higher than other elements. The change trend of grain yield per unit area was the same as that of climatic productivity in the same period and climatic factors could indirectly affect grain yield by affecting climatic productivity. Under the background of climate warming, the increase of climate productivity caused by rainfall in Maoming was not obvious, so it is necessary to make rational use of water resources in order to make the climatic advantages of Maoming more stable.