In this paper,the orthogonal design was used to optimize ISSR-PCR amplification system on jujube in four levels of five factors(Taq DNA polymerase,Mg2+,DNA template,dNTP,and primer)respectively.The result of PCR was analyzed by software SPSS,and the result showed that:①The affections of each factor in different levels were found and the quantity of Taq DNA polymerase was the most effective factor to the result of PCR; ②A most suitable ISSR-PCR system for jujube was established,it is 25ul reaction system whi...