The improved method of SDS DNA isolation is used to extract total DNA from tender or old leaves of \%Prunus mume\% in this study. High quality total DNA from plant was isolated in less than 3 hours. The values of OD 260 / OD 280 of each sample were between 1 7 and 1 9 Strips in agarose electrophoresis were clear and less decomposed. DNA samples with high purification and high yield rate could be gained by this method. It is much more simplified than former methods at many steps. The p...