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在卡氏定理的基础上，将求解给定位置变形的卡氏定理延拓至求解未定位置最大变形的极值定理。进而给出确定最大变形的公式。为工程结构的刚度设计提供了依据。
On the basis of the card’s theorem, the card’s theorem for solving the given position deformation is extended to the extreme value theorem for solving the maximum deformation in the undetermined position. And then give the formula to determine the maximum deformation. It provides the basis for the stiffness design of engineering structure.