The invention discloses a method of constructing module to blend material stream and fix up two phase in the mix canister of beater, which is useful in the construction technology industry. This invention concentrate on the complicated density phrase and several phrase system, with the scatter unit method, and enlarge it to the data simulation of 3-D fluid flows and liquid two phrase flow, build group grain and group track soft module, simulate flow continue phrase by Navier-Stokes equation,at the same time, simulate the effect of grain disperse phrase by disperse unit method, the soft module construction of the collision among the grain is built by diverse unit method, to achieve the data simulate of 3-D two phase of blend material, at last optimize the parameter of blend canister. This invention decrease the work intension of the blend canister design, improve the design efficiency, at the same time optimize and improve the capacity of canister. The blend canister which is designed by this method has good capacity, and has been produced in large number, has got good economy and society effects.