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Without any simplification the full scale and three dimensional mathematical model of structured mesh was built according to the actual structure of disengager and the numerical simulation of the flow in FCC disengager was carried out by applying RNG k-ε Model and Eulerian multiphase model.The primary cyclone separator was connected to the secondary cyclone separator by a conduit, which prevented random post-riser thermal cracking of the hydrocarbons after they exit the secondary cyclone separator in the FCC disengager.Detailed gas oil and catalyst distribution was obtained and the effect of the conduit linkage on the gas oil flow behavior in the FCC disengager was analyzed.It was shown that the conduit linkage can dramatically reduce the quantity of gas oil to enter the disengagement space, effectively preventing the formation of coke in the separation system and FCC disengager shell and ensuring the normal and long period running of the FCCU.