Turbidity currents in estuary often encounters stratified seawater which may significantly influence its propagation and deposition. This study presents high-resolution numerical simulations of turbidity currents in linear stratifications on a flat bed. Laboratory experiments are conducted to validate the numerical model and good agreements between numerical results and measurements are found. The evolution process, front velocity, internal wave, and entrainment ratio are analyzed based on the numerical results. During the evolution process of a turbidity current, the ambient stratification is found to damp the turbulent structures, and front velocity and therefore increase the sedimentation of suspended particles.