Abstract: Because in the super high density cement slurry there are a lot of inert particles and the contradiction between cement slurry rheological property and cement set mechanical behavior，based on these conditions，the weight agent granular size model and the weight agent model are established by using the particlesize distribution and the theory of close packing and calculating the area percent in the cement set uint area.The match of weight agent granular size in the system is adjusted and its quantity optimized，cement set anticompression strength design meets requiremet while calculating the 3rated grains with the model，the best match relation of weight agent granular size is r₁∶r₂∶r₃=1.00∶0.40∶0.07，and the quantity ratio of weight agent is V₁∶V₂∶V₃=354∶45∶1.A lot of experiment demonstrate the cement set anticompression strength of 2.6g/cm3 can reach 12MPa （50℃，24h）by reasonable match of weight agent granular size and controlling its quantity，and the rheological property of super high density cement slurry is very good，so it is very easy to produce in the different oilfield.

Key words: super high density, cement slurry, weight agent, anticompression strength, granular size, optimization