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Sweet Osmanthus are rich in polysaccharose and polyphenol which disturb RNA isolation purity and efficiency, so extracting high quality RNA is of crucial to the following experiments such as constructing high quality cDNA liabrary, transcriptome sequencing,functional gene cloning.In order to fingding out the appropriate mehod for sweet Osmanthus, the Ri xiang gui flower had been used for RNA extraction by Qiagen RNA extranction kit according the instruction with little improvement in this thesis.