replace efficiency is most difficult to control factors during cementing construction process. Improving the efficiency of cement injection can effectively replace drilling fluid, remove drilling mud cake, so as to improve the deficiency of cement bond quality and cement ring seal performance, is the premise to prevent oil, gas, water channeling. Along with the development of the mining technique, cementing replace efficiency is put forward higher request: influence factors of replace efficiency complex and changeable. Aiming at the several major key factors influencing the replace efficiency make thorough research. Combined with daqing oilfield in recent years using more and more high-density drilling fluid that lessens cementing replace efficiency by the actual. according to the actual data analysis, provide basis for daqing oilfield high-density cementing construction design and improve replace efficiency measures.