A ffected by n a tu ra l c o n d itio n s a n d h u m a n a c tiv itie s ,th e g ro u n d w a te r e n v iro n m e n t h a s c h a n g e d a lot. T h e g ro u n d w a te r p o llu tio n p ro b le m s h a v e b e e n p a id w id e a tte n tio n . It is v ery im p o rta n t fo r th e g ro u n d w a te r p o llu tio n e v a lu a tio n to d e te rm in e th e b a c k g ro u n d v a lu e e x a c tly . T h is p a p e r p ro v id e d th e a n a ly sis o f 150 g ro u p s o f g ro u n d w a te r c h e m ic a l s a m p le s in th e H a rb in a re a o f th e S o n g n e n p la in . By th e a n a ly s is o n th e reg io n al flow field a n d s u p p ly ru n o ff c o n d itio n ,th e m a th e m a tic a l s ta tis tic s m e th o d a n d e x - p e rie n c e m e th o d w e re a p p lie d to c a lc u la te th e g ro u n d w a te r e n v iro n m e n t b a c k g ro u n d v a lu e s o f th e u n c a n fin e d w ater a n d c o n fin e d w at(*r.T hen, th e c o m p a riso n w as m a d e on ih e re s u lts o b ta in e d from th e two m e th o d s. 1 h e re s u lts show th a t th e m a th e m a tic a l s ta tis - tic s m e th o d is b a se d o n th e c o m p re h e n s iv e effect o f th e n a tu ra l g e o g ra p h ic a l e n v iro n m e n t a n d lo n g - te m i h u m a n a c tiv itie s , w h ich ctm o v e re m n e llie sh o rtc o m in g s o f e x p e r ie n c e m e th m h a m i it c a n a lso tm th fu lly re fle c t th e h a( kgr(m iul th e stu d y a re a . T h e b a c k g ro u n d v a lu e s o f N 0 3 , F e a n d Mn in p h re a tic w a te r a n d F e a n d M n in c o n fin e d w a te r in th e a r e a a re h ig h . T lie g ro u n d w a te r e n v iro n m e n l b a c k g ro u n d v a lu e s a re clo se ly re la te d w ith h u m a n arliv ilit? s, re c h a rg e , n m o ff. d ra in a g e a n d se d imentai*y c o n d itio n s o f th e g ro u n d w a te r in th e a re a .