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地下水是古气候信息的载体，它的化学成分和同位素组成可以反映古气候的演变。应用３Ｈ、１４Ｃ和３６Ｃｌ资料计算的河北平原地下水的年龄如下：第１含水组（Ｑ４）０～３ｋａ，第２含水组（Ｑ３）３～１００ｋａ，第３含水组（Ｑ２）１００～３００ｋａ，第４含水组（Ｑ１）３００～７００ｋａ。根据δ１８Ｏ和δＤ计算的地下水补给期的地面平均气温表明，第四纪以来河北平原气候环境是逐渐变暖的。根据第４至第１含水组（Ｑ１～Ｑ４）地下水δＤ＝－７０‰的等值线变化，认为第四纪以来，渤海海岸线逐渐由东向西移动。
Groundwater is the carrier of paleoclimate information, its chemical composition and isotopic composition can reflect the evolution of paleoclimate. The ages of groundwater in Hebei Plain calculated by 3H, 14C and 36Cl data are as follows: 0 ~ 3ka for Q4, 3 ~ 100ka for Q3, 100 ~ 300ka for Q2, 4 water group (Q1) 300 ~ 700ka. The average surface temperature of the groundwater recharge period calculated from δ18O and δD shows that the climate in Hebei Plain is gradually warming since Quaternary. According to the contour change of groundwater δD = -70 ‰ in the 4th to the 1st water-bearing groups (Q1 ~ Q4), the coastline of Bohai Sea gradually moves from east to west since Quaternary.