The fourth stage, Yan culture decline phase, including the Ninth Yan culture, age is equivalent to the late Warring States period.

第四阶段，燕文化的持续扩张，包括燕文化的第九期，年代相当于战国晚期。

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Based on the forms and combinations of the pottery vessels (imitated the bronze vessels) for ritual purposes, this paper argues that the tomb should be dated to late Warring States period.

本文根据墓中仿铜陶礼器的形制与组合特点，结合古代文献记载，论证其年代当在战国晚期。

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