Flow structures on free jet flow are investigated by means of direct numerical simulation (DNS) method. The flow structures within the jet are investigated by tracking material lines and material surfaces using the Lagrangian tracer method. The timeline tracking results revealed the presence of high- and low-speed regions within the jet. Further studies utilizing material surface tracking reveal localized kinks, bulges, and depressions structures resembling the soliton/like coherent structure (SCS) within both high- and low-speed regions. The evolution of these three-dimensional (3D) wave structures follow patterns similar to those of SCSs in flat-plate boundary layers. This finding provides evidence that SCSs are dominant flow structures for the turbulent generation in shear flows.