the present work was conducted at governador dix-sept rosado county, microregion a？u-apodi, in the state of rio grande do norte and its objective was to study the effects of sprinkler irrigation system on the density of the root system of 'pacovan' banana plants. the experiment followed a completely randomized block design, in a split-plot scheme, with five replications. the treatments were two sampling groups, taken per plant, and in the opposite side of the inflorescence emission, forming between them an angle of 45°. in each sampling group, four samples containing soil material were collected at intervals of 20 cm, so the first was distant 30 cm and the last 90 cm from the pseudostem. data analysis showed that occurred a linear reduction in root fresh weight and in lenght of roots density, in replications to soil depth. for the distance from the plant pseudostem there were no significant differences between samples, both for root fresh weight and lenght of roots density.