T h e co n to u r m ap is an im portant rep resen tatio n o f the g ro un dw ater m onitoring resu lts tlata. A ccord ing to the b u sin e ss fun ction al n e e d s of G rou nd w ater M onitoring C enter, M inistry of W ater R eso urces, th e spatial int(T{K)laiion and co n to u r algorithm library w ere d e v e lo p e d , in clu d in g regularization grid in te rp o la tio n , co n to u r generatio n , trim , a re a fills, statistical an aly sis, gro un dw ater d e p ressio n iden tificatio n, sectio n al draw ing arul o th e r functions. T h e algorithm h as beijn successfu lly ap p lied lo the nationw ide gro un dw ater l>usiness a n a ly sis and d istrib u tio n system . 1'he d ata te st in 17 p lain areas of 18 p ro vinces show th e good ru n n in g in five years, w hich e n h a n c e the p ro cessin g efficiency of th e g ro un dw ater m onitoring inform ation. On th is basis, co n to u r draw ing softw are CONM AS was developecl, w hich c a n l>r dow nloaded for free trial.