In order to explore how to extract more transport information from current fluctuation,a theoretical extraction scheme is presented in a single barrier structure based on exclusion models,which include counter-flows model and tunnel model.The first four cumulants of these two exclusion models are computed in a single barrier structure,and their characteristics are obtained.A scheme with the help of the first three cumulants is devised to check a transport process to follow the counter-flows model,the tunnel model or neither of them.Time series generated by Monte Carlo techniques is adopted to validate the abstraction procedure,and the result is reasonable.