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By simultaneously describing the data of isospin sensitive nucleonic flow andpion observables, such as $v_2^n/v_2^{ch}$ and $\pi^-/\pi^+$, withultra-relativistic quantum molecular dynamics (UrQMD) model, we got thesymmetry energy at flow and pion characteristic densities which are$S(1.2\rho_0)=34\pm 4$ MeV and $S(1.5\rho_0)=36\pm 8$ MeV. Within theuncertainties, the constraints of symmetry energy at characteristic densitiesare consistent with the previous constraints by using other transport models.The consistency suggests that the reliable constraints on symmetry energyshould be presented at the characteristic density of isospin sensitiveobservables. By using the constraints of symmetry energy at two differentcharacteristic densities, the extrapolated value of $L$ is provided. Within$2\sigma$ uncertainty, the extrapolated value of $L$ is in $5-70$ MeV which isconsistent with the recent combination analysis from PREX-II and astrophyiscsdata. Further, the calculations with the constrained parameter sets candescribe the data of charged pion multiplicities from S$\pi$RIT collaboration.

How Do Constraints of Nuclear Symmetry Energy Reconcile with Different Models?