Abstract: The accumulation and flow of oil and gas in porous media of the reservoir which forms an interaction system with reservoir porous media.Because of the small reservoir porosity and big surface area,some fluid will be adsorbed on the surface of pores to form adsorbed phase,which will affect fluid phase and the flow law.Especially in the low permeability porous medium,adsorption phenomenon is more serious.Based on the characteristics analysis of hydrocarbliquid on adsorption in porous media,an adsorption study of three hydrocarbon liquid mixture in real rock is carried out.The results show that for the low-permeability reservoir,the impact of absorption can not be ignored.