本文用动态规划方法讨论了一类社会经济系统模型结构变化点的问题，并通过实例进行了验证。

This paper discussed a class of social economic system models structure change point by dynamic programming method, which are illustrated by examples.

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通过对酒泉市耕地的动态变化分析，得出影响酒泉市耕地变化的因素是自然因素和社会经济因素。

By analyzing the dynamic changes of cultivated land in Jiuquan City, it was found that the factors of influencing the cultivated land changes were the natural and economic factors.

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通过对酒泉市耕地的动态变化分析，得出影响酒泉市耕地变化的因素是自然因素和社会经济因素。

By analyzing the dynamic changes of cultivated land in Jiuquan City, it was found that the factors of influencing the cultivated land changes were the natural and economic factors.

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