Abstract: The effects of ginkgo wheat inter cropping on heat of daytime and field water were studied in the Huang Huai Hai Plain. Comparing with the sole wheat field(CK), the results showed that:(1) during the wheat filling maturity stage, the total solar radiation flux decreased by 7.6% in a clear daytime, and there was no significant difference between the inter cropping and CK in the overcast daytime; the net radiation flux increased by 5.6% in a clear daytime, and decreased by 1.9% in a overcast daytime; the latent heat flux decreased by 6.8% in a clear daytime, and there was no significant difference between the inter cropping and CK in a overcast daytime; the sensible heat flux decreased by 52.6%,11.1% in a clear and overcast daytime respectively; the soil heat flux increased by 21.8% in a clear daytime, and decreased by 25.0% in a overcast daytime. (2) during the jointing maturity stage, the daily transpiration decreased by 18.3%; the water consumption proportion through transpiration of wheat to ginkgo was 10.9 in actual land area; the soil water capacity in 0 100 cm increased by 6.84%; the water utilization efficiency of wheat leaf increased by 4.0 %.