Abstract: The flow equation for a novel fluidized bed reactor which contained solid particles was presented and validated by cold state experiment. The results indicated that the sump of the reactor formed by adding some relatively big particles could prolong the fluidized time effectively. Through resident rate test, its calculation was deduced as σ=-0.51lnu-0.4m/V+2.145. As the pressure drop consisted of pipe flow drop and resident drop owing to the resident effect and the resident drop, the resident rate was introduced into Ergun equation and the pressure drop equation was concluded as Δp=150(μu0/dp2)×(1-ε)2/ε3+7/4×(ρu02/dp)×((1-ε)/ε3)Le+(1-σ)(1-εb)Leρ. The experiment of cold state experiments showed that the model could match the flow state very well.