Abstract: Results from conventional and inter-cropping cotton with wheat with film cover or without the film showed that there were great differences among those treatments in soil temperature, soil evaporation，light intensity over Cotton canopy,field humidity，growth period，plant characters,economic features,etc．．The length of the co-growth period of cotton with wheat is the main factor affecting Cotton seedling growth．even its later growth．Heat is the main environmental factor affecting cotton seedling growth．