Hydraulic jump in channels and hydraulic systems is a common hydraulic phenomenon, interested design engineers and researchers. Hydraulic jump is a transition from super- to subcritical flow. The location of the hydraulic jump is dependent on the upstream and downstream depths, changing significantly by a small change of the conjugate depths. Usually, in the irrigation channels, flow fluctuations and flow head loss are not favorable, instead the designers prefer to exchange the excess kinetic energy to the potential energy with a minimum head loss. Due to the disadvantages encountered by creation of a hydraulic jump, the idea of super- to subcritical flow transition without a hydraulic jump has been recently proposed. In the present study, to change the flow regime from super- to subcritical flow without a hydraulic jump, the analytical, numerical, and experimental studies were performed , applying appropriate cross-sectional transition structures along the channel. The aptitude of the designed transition structures, based on analytical modeling, to eliminate the hydraulic jump was verified by the experimental modeling as well as a numerical simulation using STAR CCM+ software. Firstly, analytical modeling was performed and the geometrical aspects of transition structures were determined. Based on model experimentation, the hydraulic characteristics of super- to subcritical flow transition without a hydraulic jump were investigated on the basis of flow field observations and flow measurements. For numerical simulation, the flow volume of fluid method (VOF) was applied to study the water free-surface and the hydrodynamic characteristics of flow field. Examining different turbulence models, the k-? RNG model was selected as the best choice. The numerical results show an acceptable agreement with the experimental data. Notably, to design the models based on analytical modeling, special design Froude numbers should be considered. The experimental observations confirmed the ability of transition structures to eliminate the hydraulic jump. Based on the numerical simulation, velocity distributions and some hydrodynamic characteristics of the flow along the cross-sectional transition structures were obtained and validated. By the transition of super- to subcritical flow without a hydraulic jump, for the design Froude numbers of 2 to 8, we observed that in a small region downstream of the structure, there are disturbances and small perturbations, leading to an increase in the tail-water depth. According to the numerical simulation, different hydrodynamic characteristics of flow including turbulent intensities, Reynolds stresses and turbulence kinetic energy were determined and discussed. A properly designed cross-sectional transition structure, could eliminate the hydraulic jump and the corresponding vortices, leading to prevent the channel bed and side-walls, especially in the erodible channels. Keywords : Supercritical flow, Subcritical flow, Hydraulic jump removal, Constructive structure.