Abstract: Toona ciliate var.yunnanensis is a variation of Toona ciliate,which belongs to Meliaceae,Toona Roem.So far,there are no documents or reports about the research of its intraspecific genetic variation or diversity of Toona ciliate var.yunnanensis.Based on the predecessors,research,this article summarizes the research of phenotypic traits genetic diversity and the main problems in its genetic diversity research.In addition,it is suggested that some further research work should be done on the germplasm resources distribution and,phenotypic traits variation of Toona ciliate var.yunnanensis,aiming to ascertain the horizontal distribution and vertical distribution range and to master the rule of phenotypic distribution range and the rule of phenotypic traits variation,thus providing a scientific basis for subsequent selective breeding and germplasm resources preservation strategy.