The paper indicates the performance of the diseases in the widened subgrade of expressways, and illustrates the prevention strategies for the widened subgrade diseases on the expressways from the step excavation, subgrade compaction, geogrid, and pavement, according to their mechanism for the diseases, so as to improve the construction of the expressways.%描述了高速公路拓宽路基病害的表现形式，根据拓宽路基病害的产生机理，从台阶开挖、路基压实、土工格栅铺设等方面，阐述了高速公路拓宽路基病害的防范对策，从而提高高速公路的建设质量。
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