A new Lorenzlike chaotic system was presented.The nonlinear characteristic and basic dynamic properties of this threedimensional autonomous system were studied by means of nonlinear dynamics theory, numerical simulation,Lyapunovexponent spectrum,Lyapunov dimension,bifurcation diagram and Poincaré section map.The oscillator circuit of the new chaotic system was designed by using EWB software,and a typical chaotic attractor was demonstrated by circuit experiment.