Abstract: High energy surface multiples are commonly developed in marine seismic data.Traditional surface multiples suppression(SRME) can predict all order surface multiples,but surface multiples were stack together.In order to utilize different order surface multiple independently to image subsurface structure and reduce the influence of interference,it is necessary to separate different order surface multiples.In this paper,we proposed a way of separating single order surface related multiple based on extended SRME.First,all order surface related multiples were predicted by SRME.Second,the boundary conditions of conventional SRME were modified,and the predicted surface multiples from the first step were updated.Third,single order surface multiple can be obtained by the adaptive subtraction between multiples from the first step and the second step by which surface multiples of different orders can be separated gradually.Numerical model and a deep-sea real data test show the effectiveness of this method.Different order multiples were separated effectively,which supports the application of multiples imaging technology.