Abstract: We propose a new OADM structure design,which uses a multi-ports optical circulator (OC) with fiber Bragg grating(FBG) and reduces the number of circulators.Therefore,it is cost-effective,If we want to add-drop one wavelengh,only one FBG will be needed,and if we want to add-drop many wavelengths,2 m FBGs must be needed.The computer simulation experiment shows that the loss of this structure is lower than that of H.Yuan's structure.It can drop many wavelengths.With the development of Internet,the much faster transport networks will be needed.The structure is important for aii-optical network realization.