[Objective] The research aimed to study the reproductive allocation of four kinds of cluster-type grass ground biomass.[Method] The four kinds of cluster-type grass which were Poa pratensis,Elymus sibiricus,Agrostis clavata and Roeqneria kamojiowi in Changbai Mountain were the research objects.The proportions of vegetative shoot and reproductive shoot component biomass to total ground biomass in every population were counted.[Result] The allocation proportions of four kinds of cluster-type grass reproductiv...