Different from common deltas which are made of distributary channels，distributary mouthbars and sheet like sand sheet，the primary element of overlapping delta are lobes. Different lobes can form complex lobe combinations，which eventually form the delta. Single lobe is deposited through the expansion or laterally sweeping，while the complex lobe combination is formed through the progradation (retrogradation) or laterally moving of single lobes. Delta architecture is very complex because of the overlapping pattern of the lobes. There is no united distributary channel system which can string all the lobes for they are formed in the lower place of the delta front in different time and space，and controlled by the micro geomorphology. The lobes are overlapped in 3D space with a very complex relations to each other. Single lobe，as the primary element，is very small and can be correlate between wells within a small area in the frame of complex lobe combination. The contact of lobes and the characteristics of the surface between lobes control the connectivity of lobes and eventually make deep influence of the fluid flow in the reservoir. The overlapping of lobes can form continuous sandsheet which made it possible to form gaint fields，while the distribution of shale between lobes may compart the lobes to form litho traps and bypass oil will also be formed in the isolated lobes.