By considering both the effects of the nucleon-nucleon short-range correlations and the isospin-dependent inmedium inelastic baryon-baryon scattering cross section in the transport model,two unrelated Au+Au experimental measurements at 400 MeV/u beam energy are simultaneously analyzed,a mildly soft symmetry energy at supra-saturation densities is obtained[1].In our transport model,by considering the effects of the nucleon-nucleon short-range correlations on the kinetic symmetry energy,a new density-dependent symmetry energy is recent obtained.Fig.1 shows the density-dependent symmetry energy with different x parameters.