Abstract: ObjectiveGrowth vigor and leaf physiological features among different cassava varieties during seedling stage were compared in order to provide theoretical references for breeding high-yield cassava varieties.MethodEight cassava varieties were taken as the materials,namely Guiken 09-26,Guiken 09-11,SC 205,Xinxuan 048,SC 124,Fuxuan 01,Nanzhi 199 and GR 891.Plant height,stem diameter,chlorophyll content,soluble sugar content,sucrose content,reducing sugar content,and starch content were analyzed in this experiment.ResultPlant heights of Guiken 09-26,Xinxuan 048,SC 205 and Guiken 09-11 were tall during seeding stage.Stem diameters of Fuxuan 01,Guiken 09-26,SC 124 and Xinxuan 048 were thick.Chlorophyll contents of Guiken 09-26,Fuxuan 01,Nanzhi 199 and GR 891 were high.Soluble sugar contents of Guiken 09-26,SC 124,Guiken 09-11 and Xinxuan 048 were high.Varieties with high sucrose content were SC 205,SC 124,Guiken 09-26 and Xinxuan 048.Xinxuan 048,SC 205,SC 124 and Nanzhi 199 contained high reducing sugar content.Starch contents of Fuxuan 01,GR 891,SC 205 and Xinxuan 048 were high.ConclusionThe superior varieties are Guiken 09-26,Xinxuan 048 and SC 205,which contain high soluble sugar content,reducing sugar content and sucrose content during seedling stage,and have sound growth vigor.All these advantages are beneficial for root yield and starch content at late growth period.