Abstract: Pot experiments were carried out to investigate root morphology of four typical cultivars of water spinach (Ipomoea aquatica Forsk.) involved in Cd accumulation. The results show that the effects of cultivars and soils on the root morphological parameters are all significant (p0.01). Compared to non-Cd-PSCs, Cd-PSCs have the following characteristics. Total root length, average diameter, total surface area and total volume are all relatively low; the difference between cultivars in total volume is the biggest (47.37%), followed by total root length and total surface area (44.50% and 43.05%, respectively), and average diameter is the smallest (7.71%); the parameters of different diameter are all relatively low; the differences in root length, surface area and volume between cultivars are mainly reflected at D 1.0 mm roots. Our results indicated that the root quantity of Cd-PSCs is relatively low. The root morphological characteristics of the four typical cultivars are consistent under different soils. Correlative analysis showed root morphological characteristics of water spinach typical cultivars might affect both the capacity of Cd uptake from soil to root, and the capacity of Cd translocation within plants.