To explore a simple and high yield method for preparing DNA suitable for RAPD analysis, trace fresh and dried leaves of Camellia japonica L. were used as materials. Moreover, the improved CTAB, SDS and Triton X-100 methods without using liquid nitrogen were compared. The efficiencies of different DNA extraction methods, the effects of material preservation and material amounts on DNA qualities were compared based on the absorbance spectrum and ratio of absorbance at 230 nm, 260 nm and 280 nm by Ultraviolet ...