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It is important that developing and utilizing of unconventional water resources such as pond water in the lowland area of North China Plain due to the shortage of fresh water resource. Thus, making clear the storage capacity of pond as irrigation water resources in years with different amount of precipitation and studying the relationship between precipitation and pond water storage are of great significance to the usages of multiple water resources in agriculture. Taking Nanpi County in Hebei Province as study area, this paper used the methods of Cl- and stable isotope balance to calculate the contribution of precipitation to pond water in rainy season. Besides, based on the Landsat TM remote sensing data during 2013- 2015, the improved normalized difference water body index was used to extract the pond information and analyze the water storage capacity of ponds in Nanpi County in years with different amount of precipitation. The results showed that precipitation is the main source of pond water, and the groundwater was the second source. According to the calculation of Cl- and stable isotope, precipitation accounts for 74.3%-86.0% of water supply for medium and small ponds during the rainy season in wet year, however, it accounts for only less than 30% of water supply for large ponds. The ponds are mainly small ponds with area less than 0.5 hm2. The number and the water storage area of ponds with different areas changed with precipitation. The water storage capacity of ponds in flat water year, dry year and wet year were 1.49×107, 0.84×107 and 1.90× 107 m3, respectively. The results provide important infromation for the pond water management and utilization in the lowland area of North China Plain. [ABSTRACT FROM AUTHOR]