An experimental and supplementary numerical model for ceramic filtration with considering the effect of particle deposit is proposed. A comparison between the model and experiments indicates that the early stage of initial model agrees well with the experiments but the deviation is increasingly growing as time passing because of the continuous detachment of dust. To ensure predictive accuracy, the Fourier fitting method was applied to acquire the variation of specific deposit in the detaching stage (R-square >= 0.9997). A modified model consisting of three stages was proposed by using initial model on depositing stage without detachment, employing Fourier fitting equations on depositing stage with detachment. Then, the influence of specific deposit and mean porosity (of ceramic-cake) on pressure drop was studied. It suggests that heavy specific deposit, small mean porosity and large wall thickness significantly help the improvement of pressure drop. At last, the time dependence of pressure drop was established by using the modified model of specific deposit. The results show that the pressure drop of TCP-LG100 increases rapidly because of heavy specific deposit and large wall thickness, and those of TCP-LG80, and TCP-LG50 increase slowly, and then rapidly, and then slowly, and eventually tend to constant values.