Abstract: In order to study the effects of 4 factors（namely film hole diameter, film hole spacing, initial volume water content of soil and infiltration water head） on the unidirectional intersection infiltration characteristics of film hole irrigation, the reliability of HYDRUS-3D simulated unidirectional intersection infiltration process of film hole irrigation was verified by the infiltration test data of indoor soil box. The unidirectional intersection infiltration process under different pore diameters, pore spacings, initial volume water contents of soil, and infiltration water heads were simulated by HYDRUS-3D. The unidirectional intersection infiltration rules under the coupling conditions of various factors were analyzed, and the empirical models between each influencing factor and cumulative infiltration per unit pore area, intersection time, and intersection surface area were established. The results show that the influence degree of the 4 factors on cumulative infiltration per unit pore area from large to small is pore diameter, initial volume water content of soil, pore spacing, and infiltration water head. The degree of influence from large to small on the occurrence time of film pore intersection is as follows: film pore spacing, film pore diameter, initial volume water content of soil, and infiltration water head. At the end of infiltration, the degree of influence on the wet-body area at the intersection surface is as follows: pore diameter, pore spacing, initial volume water content of soil, and infiltration water head. The research results can provide a theoretical basis for determining the optimal combination of film hole irrigation technology elements.