Abstract: The free segment probability of polymer solution was derived with Flory-Huggins model,Guggenheim model and Revised Freed model of Hu et.al.On this basis,the corresponding free segment proability of polymer at the adsorption layer of the solid/liquid interface was established by the method of amalogy.Combining with DiMarzio-Rubin’s matrix statistical method,the polymer adsorption models at the solid/liquid interface based on close packed latticed model were established.The polymer concentration profiles predicted by these models have been compared with the Monte Carlo computer simulation results.It was shown that the calculated results by adsorption model based on revised Freed model and the Guggenheim model were better than that by adsorption model based on the Flory-Huggins theory.