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对黑龙滩水库夏季不同水位时理化性状进行差异显著性分析以及外源性输入和理化性状在库区的变化过程比较分析，得出高水位时输入水中Mg，Ca，SO，NO3－，TN，硬度及电导率均显著高于低水位时，而CODCr和NH3＋含量则显著低于低水位时。高水位时理化指标在库区的变化幅度比低水位时高。说明高水位时生物活动强度比低水位时高。
Significant difference analysis was made on physicochemical properties of Heilongtan reservoir at different water levels in summer and comparative analysis of exogenous input and physicochemical properties in the reservoir area was made. It was concluded that the contents of Mg, Ca, SO, NO3-, TN, Hardness and conductivity were significantly higher than the low water level, while the CODCr and NH3 + content was significantly lower than the low water level. Physical and chemical indicators of high water level in the reservoir area of variation is higher than the low water level. Explain the biological activity intensity of high water level is higher than that of low water level.