Morphological characteristics of Ipomoea cairica was observed and they included biomass,length of root and stem etc.in two different growing periods and the data were analyzed statistically.The results showed roots,stems and leaves increased two to five times between 3-month old and 5-month old plants.Water content was among 7.41%~82.99% without any significant difference.Significant difference was observed for root/shoot ratio,in which the root/shoot ratio of Ipomoea cairica was lower than other herbaceous plants.Root lengths reached 57cm and 87cm,and mean stem lengths 319cm and 714cm at the two growth periods,with significant difference in root/stem ratio.Research results provide basic data for dealing with invasive species and controlling Ipomoea cairica invasion.