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Although the Shenhu sea area has been a topic and focus of intense research for the exploration and study of marine gas hydrate in China,the mechanism of gas hydrate accumulation in this region remains controversial.The formation rate and evolution time of gas hydrate are the critical basis for studying the gas hydrate formation of the Shenhu sea area.In this paper,based on the positive anomaly characteristics of chloride concentration that measured in the GMGS3-W1 9 drilling site is higher than the seawater value,we numerically simulated the gas hydrate formation time of GMGS3-W19 site.The simulation results show that the gas hydrate formation rate positively correlates with the chloride concentration when the hydrate reaches the measured saturation.The formation time of gas hydrate in the GMGS3-W19 site is approximately 30 ka.Moreover,the measured chloride concentration is consistent with the in-situ chloride concentration,indicating that the formation rate of gas hydrate at the GMGS3-W1 9 site is very fast with a relatively short evolution time.