Populus, as a model perennial woody species, is the first tree species that has been finished whole-genome sequencing. Promoted by the Populus Genome Plan, the Populus microarray technology improved evidently. The method that combines the technologies of statistics, informatics and traditional biology, has been used to mine and analyze microarray data profoundly, which enhanced the research area of genome evolution, wood formation, hormone metabolism, flowering, dormancy and so on.