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The development of wetting zone in soil under film hole irrigation is a crucial parameter for designing an effective irrigation system. HYDRUS-2D/3D numerical simulation was used to study the effects of soil bulk density and film hole diameter on the soil infiltration characteristics under 12 soil textures.Based on 180 simulated results, the parameters of the wetting front movement model were improved. The accuracy of the model was validated against experimental data published in the literature and measured by authors. The results showed that the migration process of soil wetting front was increased with the increase of film hole diameter and irrigation time, however it was decreased with the increase of soil bulk density. The migration distance of the wetting front had a power function relation with the steady infiltration rate and time,whereby the model of wetted volume was established for different soil texture types. For a given soil texture, the steady infiltration rate had a good power function relationship with soil bulk weight and film hole diameter with power function exponents of -6.3 and 1.1, and the power function coefficients was deduced from only one set of cylinder infiltrometer field tests. The model simulation values were in good agreement with the measured values from 12 groups experiments, the RMSE was between 0.020cm and 0.170cm, and the NSE was between 0.995 and 0.999, which realized the practical application of the empirical model for predicting the wetting pattern dimensions under film hole irrigation in the field with simple experimental design, easy operation and quick field evaluation.