The lake sediment of the middle and late time of late Pleistocene reflects a wet climatic characteristic of the Yanhuai basin.
延怀盆地晚更新世中晚期湖泊沉积反映了潮湿气候的特征。
The Xijiang River's inorganic carbon source was major from karst process in the drainage basin. Due to the "washing effect" , the content of HCO3- ion increased in the wet season.
西江无机碳主要来源于岩溶作用，由于受河流冲刷效应影响，丰水期HCO_3~-离子含量升高；
Chemical index of the illite samples is higher than 0.5, indicating that clay minerals had undergone strong chemical weathering and interior of the Basin had a relatively warm and wet climate.
同时，所有样品伊利石化学指数值均大于0.5，说明粘土矿物经历了强烈的化学风化作用，盆地内部为暖湿气候。
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