The present invention provides a composition of a solvolysis product of an ethylene-vinyl ester copolymer excellent in productivity and formability which has a small absolute value of melting peak even in the case where two or more kinds of solvolysis products of ethylene-vinyl ester copolymers are blended. The invention rolates to a process for manufacturing a composition of a solvolysis product of an ethylene-vinyl ester copolymer, which comprises conducting solvolysis of an ethylene-vinyl ester copolymer (A') and a modified ethylene-vinyl ester copolymer (B') comprising a structural unit derived from a compound represented by the following general formula (2) in one system, and manufacturing the composition of a solvolysis product of an ethylene-vinyl ester copolymer comprising a solvoysis product of the ethylene-vinyl ester copolymer (A) and a solvolysis product of the modified ethylene-vinyl ester copolymer (B) comprising a structural unit represented by the following general formula (1), wherein a ratio of an ethylene content (B')/(A') in the step of conducting solvolysis is 0. 3 or more and less than 1: wherein R1, R2 and R3 each independently represent a hydrogen atom or an organic group, X represents a single bond or a bonding chain, and R4, R5 and R6 each independently represent a hydrogen atom or an organic group; and wherein R1, R2 and R3 each independently represent a hydrogen atom or an organic group, X represents a single bond or a bonding chain, R4, R5 and R6 each independently represent a hydrogen atom or an organic group, R7 and R8 each independently represent a hydrogen atom, a hydrocarbon group or R9-CO-(wherein R9 represents an alkyl group), R7 and R8 may bond to form a five-membered ring and the five-membered ring represents a cyclic carbonate structure or a cyclic acetal structure.