In order to explore the relationship between water balance factors and its influencing factors in paddy fields, seepage tests and field water balance tests were carried out in the selected typical paddy fields in Ganfu Plain irrigation area of Poyang Lake Basin and combining with irrigation experiment data series of Irrigation Experiment Center of Jiangxi Province. The seepage test on the ridge showed that the lateral seepage velocity of the ridge was 3. 97 mm/d, and the lateral seepage accounted for 49. 2% of the evapotranspiration and infiltration in the paddy field, which would be reused in the lower field or downstream area. The water level of the upper frame and double rings showed a straight downward trend. In the case of low water layer(30 mm water cover), the depth of water cover had little effect on field seepage, and the field seepage(vertical and lateral seepage)remained relatively stable. The field water balance test showed that the irrigation and drainage of typical paddy fields were significantly less than those of bottom survey pits. During the whole growth period of rice, the lateral seepage of typical paddy fields accounted for a considerable proportion of the local paddy field seepage, accounting for 10. 9% of the total water consumption during the whole growth period.