【Objective】Check dams, as one of the core projects for soil erosion control in the Loess Plateau region, have played an irreplaceable role in preventing soil erosion and improving the ecological environment. By intercepting runoff and depositing sediment, check dams effectively reduced soil erosion, which in turn improved the local ecological environment and agricultural production conditions. However, despite the remarkable success of check dams in soil and water conservation, research on the perched water in dam lands on the Loess Plateau remains insufficient, particularly in understanding the recharge process and mechanisms of the perched water. The study is of great significance for the comprehensive understanding of the ecological function and hydrological role of check dams.【Method】Based on this, dam lands were selected in typical watersheds of the Loess Plateau as the research object, and using iodide and bromide ions as tracers, along with water level monitoring and chlorine mass balance method, the recharge process of perched water in the dam land was systematically traced. The core objective of the study was to reveal the recharge process and mechanism of perched water in dam land under different land use types, and to provide a scientific basis for water resource management.【Result】The results showed that soil moisture in the dam land under different land use types followed the order: farmland > shrubland > arbor land > grassland. Different land use types had a significant impact on the recharge rate of perched water in the dam land. Specifically, the recharge rate of farmland was the highest, followed by arbor land, then grassland, with shrubland having the lowest recharge rate, ranging from 32.94 to 60.96 mm·a-1. This difference reflects the influence of different vegetation types and land management practices on the perched water recharge process, providing important clues for understanding the hydrological functions of different ecosystems. Furthermore, it found that when the precipitation exceeded 15 mm·d-1, water could infiltrate into the perched water and quickly recharged it. At this time, the vertical infiltration rate of water was about 0.13 to 0.15 m·d-1. However, this recharge process was not immediately completed as there was a lag time of about 6 to 11 days, suggesting that the recharge of perched water has a time-lag effect. In addition, the results of iodine ion tracer experiments showed that the perched water in the dam land had good connectivity, with a horizontal water transport rate of 6 m·d-1. This finding suggests that the perched water has a strong hydraulic connection, which could realize the horizontal distribution and redistribution of water within a certain range, and thus form a relatively stable hydrological cycle system on a local scale.【Conclusion】Overall, this study not only reveals the recharge process and mechanism of perched water in the dam land, but also provides an important theoretical reference and scientific basis for further understanding of the perched water in the dam land. Through these research results, the water resource dynamics of the dam land can be better grasped, and technical support can be provided for soil and water conservation and ecological restoration in the Loess Plateau region. These studies can provide strategies to optimize the management and maintenance of check dams, and further promote the protection and improvement of the regional ecological environment.