It is important to evaluate the meteorological influences to industries in the m eteorological economic filed. Cointegration theory was used to research the im pact of temperature variation on the main industries in Nanjing. First, it was p roved that there was a cointegration relationship between temperature and indu stries′ production value. Then, on the basis of cointegration regression equation and error correction mode (ECM), the longterm and shortt erm impacts of temperature variation were investigated quantitatively. At last, the result of Granger test emphasized our outcomes. It shows that the temperatur e variation really could affect the main industries′ economic s: when temperature rose, the industries′ production values would increase in the longterm, but some industries would decline in the shortterm. So, coi ntegration theory is a reasonable way to evaluate industries′ meteorological se nsitivities.