The aim of taking measures to protect paper historical relic is to improve its life expectancy and alleviate deterioration. Following the minimum intervention principle to prevent paper historical relic from devaluing and being illegible. This article discusses the application of minimum intervention principle in paper historical relic conservation and restoration through “water” selection, cleaning technologies selection and restoration skills selection. According to recent studies and cases, some reasonable guides for the selection of cleaning water, cleaning technologies and restoration skills will be given, such as “do not peel away paintings from the whole blocks, unless it is necessary”.