A method for melt-molding a water-soluble vinyl alcohol polymer which includes melt-molding a water-soluble oxyalkylene group-containing vinyl alcohol copolymer under substantially anhydrous conditions and substantially without use of plasticizer, the copolymer having a vinyl alcohol unit (A), a vinyl ester unit (B) and an oxyalkylene ether unit (C) of the formulas: ##STR1## wherein R.sup.1 is an alkyl group; R.sup.2 and R.sup.3 each is a hydrogen atom or an alkyl group; R.sup.4 is a hydrogen atom, an alkyl group, a phenyl group or a substituted phenyl group; n is equal to 1 through 50; in proportions of a mol %, b mol % and c mol %, respectively, where0.1.ltoreq.c.ltoreq.20,50.ltoreq.100a/(a+b).ltoreq.100,and the oxyalkylene moiety (CHR.sup.2 --CHR.sup.3 --O--).sub.n of unit (C) accounts for 3 to 40 percent by weight of the total resin, and having a melt index of not less than 5 g/10 min. under a load of 2160 at a temperature of 210.degree. C.