In this paper，the infiltration process of liquid preparation of composite materials has been simulated in porous media by a modified multi-component pseudopotential model ( EFM) ． A study has been conducted of the effects of viscosity ratio ( M) ，wall wettability，Ｒeynolds number ( Ｒe) ，porosity and different fractal structures on the infiltration process． It is shown that the larger the viscosity ratio is，the smaller the infiltration saturation ( S) and infiltration time ( t) will be; meanwhile the effect of viscosity ratio on infiltration saturation and time is negligible when M ＞ 90． At this time the influence of contact angle is very small; the smaller the Ｒe is，the greater the infiltration saturation and infiltration time are，and the greater the effect of wall wettability will be． When the Ｒe of inlet is consistent，the smaller the porosity is，the lower the permeability of the fractal porous will be． Due to the uneven pore distribution，the fluid preferentially infiltrates in local area，leading to the decrease of the infiltration time and the saturation． For different fractal porous media，the influence of wall wettability is obviously different． For Type A ( standard fractal) and Type C ( right deviation of solid matrix) porous media，the larger the contact angle ( θ) is，the saturation and the infiltration time is smaller． The fractal porosity of type B ( upward deviation of solid matrix) and D ( left deviation of solid matrix) fractal porous，the larger the contact angle is，the saturation and the infiltration time tend to increase firstly and decrease lately，and the extreme value appears in the contact angle which is less than 90°．