Through study on relation among deposit characteristics, useful composition contents, brine concentration and chemical compositions of subsurace brine in north part coastal area of Weifang city, it is considered that 5 mineral resources as Br, NaCl, MgCl_2, MgSO_4, and CaSO_4 have reached industrial standard, and bittern concentration has direct correlation with mineralization, NaCl and Br. The bittern in this area has the characteristics of great reserve, shallow deepness and good exploration future.