Rice is the major crop in paddy fields of Guilan province. The area under rice cultivation in Guilan is 205269 ha (about 35.8% of total paddies in Iran ). Irrigation method in paddy fields is basin type with permanent flooding. One of the important parameters in determination of rice water requirement is infiltration of water to the soil. Deep percolation is the main factor in application efficiency of a paddy field. Since the surface runoffs from paddy fields are used again for irrigation of downstream fields, irrigation losses are limited to deep percolation. If infiltration is estimated accurately, rice water requirement is evaluated better and design of irrigation and drainage systems and necessary structures is done properly. The amount of water infiltration is measured often in the center of a field, without considering the differences in the position of points (especially points near the field boundaries). In this research, spatial variation of soil water infiltration was studied in different soil textures. In each texture, in longitudinal and transverse directions, points with distance from the boundary of 0.5, 2.5, 6.5, 12.5, … m (the last point was center of the paddy basin) with three replications (0.5 to 1 m on sides of the main direction) were selected and time-variation of infiltration rate was measured. In each spot, soil bulk density and penetration resistance was also measured. Infiltration was measured by quick method, bulk density by metal cylinders (7.7 cm diameter and 4.1 cm height), and penetration resistance by penetrometer. The results of final infiltration rates showed that this parameter has different values at different locations of the paddy basin. In clay, silty clay, and loam soils, average final infiltration rates in longitudinal and transverse directions are higher than the center of the basin. For example, in clay texture, average final infiltration rates in longitudinal and transverse directions were 0.174 and 0.134 cm/day, respectively, and in the middle of the basin was 0.126 cm/day. For loam texture, the results were opposite. As was expected, because of uneven puddling in different parts of the paddy field, the infiltration rates were different. Infiltration rate of near-border points was more than the center of the basin. This shows improper puddling of the soil near the boundaries. The results also showed that bulk density varies with soil depth and the differences are significant at 5% probability level. For example, in silty clay soil, bulk densities of the first to third layers were 0.829, 0.927 and 1.014 g/cm 3 . In this soil, average bulk densities in longitudinal and transverse directions were 1.003 and 0.996 g/cm 3 . The results showed that in all the soil textures, there was significant difference between the penetratio