M oilfield belongs to shallow extraheavy oil reservoir. It has come into later stage of steam drive and takes on characteristics as high degree of recovery, increasing decline of production and shrinking benefits. In order to exploit potentialities of northern reservoir and improve the reservoir development, typical well groups were chosen for numerical simulation to optimize injection rates, team quality and to compare development effect of different intermittent steamflood. As a result, an optimal alternative was chosen for the target zone. This research approach provided a reference significance for steamflood of similar oilfield.