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4，4＇-二苯醚四甲酸二酐是合成聚酰亚胺的重要物质。本文用气相色谱法对醚酐进行了检测，分析结果的相对标准偏差在±0.5％以内。“,”4,4＇-oxy-diphthalican-hydride is and important substance of synthesizing. In this paper 4,4＇-oxy-diphthalican-hydride was detected by gas Chromatogrophic method, and the relative standard deviation was below 0.5%.