Abstract: Nan 3 block of Xinzhuang oilfield has the characteristics of stripped reservoir,active edge water and high permeabili-ty,therefore,cementing and completion of horizontal wells in heavy oil reservoir has been chosen. The research on vari-able density perforating model and optimized designed on hole density have been carried out and then the research re-sult has been successfully applied in reality,which will greatly delay the coning of edge water and provides guidance for oilfield development of the similar kind.