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Light nuclei production in relativistic $^{197}$Au + $^{197}$Au collisionsfrom 7.7 to 80 GeV is investigated within theUltra-relativistic-Quantum-Molecular-Dynamics model (UrQMD) with a naivecoalescence approach. The results of the production of light nuclei atmidrapidity can essentially match up the experimental data and a slightenhancement of combined ratio of ${N_{p}N_{t}}/{N_{d}^{2}}$ where $N_p, N_d$and $N_t$ represent respectively the yields of proton, deuteron and triton,which is sensitive to the neutron density fluctuations, occurs around 20 GeV.However, this enhanced ${N_{p}N_{t}}/{N_{d}^{2}}$ ratio should not beover-understood considering that the present UrQMD model is a cascade versionwithout equation of state (EoS), i.e. there is an absence of critical end pointmechanism. Furthermore, within different rapidity regions, the kinetictemperatures of different light nuclei are extracted by the Blast-wave modelanalysis and ratios among different light nuclei are also discussed.

Light nuclei production in Au + Au collisions at $\sqrt{s_{NN}}$ = 7.7-80 GeV from UrQMD model