Jin Mingchang 4 years (1193) buy county, name“Jing Hai ” , its meaning is to long for stable peace and tranquility. Mongolia comes yuan 2 years (1265) , and initiate plain (today Heibei saves green county) , belong to the road between the river administer, still renown “ Jing Hai”. Chaos caused by war of meantime in successive years, flood is incessant, cause decline of underpopulated, economy. Yuan day later period, control salt industry rapid and arisen, the economy of static sea area is able to restore gradually. Ming Hongwu the first year of an era or the reign of an emperor (1368) , to evade“In an attempt to of pacify difficult ” is quiet, change “ pacify ” to be “ static ” , call Jing Hai the county. In an attempt to is stable the meaning of peace and tranquility.

Two counties name forms ” of “ Ning He and ” of “ Jing Hai a matching of both sound and sense in two lines, from the analysis on semantics, the semantics of name of these two counties is “ makes area of the Bohai Sea, Haihe River forever too smooth halcyon ” .