Abstract: There are not many researches done on the regulation of revocation and alteration of wills by Article 20 of Law of Succession of the People′s Republic of China.The author thinks that in law practice，problems exist in regulations of “conflict with one another in content”，“partially conflict with one another” and of the prevalence of notarial wills.Case study reveals that the exact meaning of “conflict with one another in content” should be clearly defined，wills which “partially conflict with one another” should be defined by making reference to terms of partially invalid contracts by Labor Contract Law，and one′s last written words which can be regarded as testatorwritten wills should enjoy equal validity to other forms of wills，which，the author thinks，should also enjoy equal validity to notarial wills.

Key words: will, revocation of will, alteration of will, conflict with one another in content, notarial will, last written words