According to the frame of construction grammar, the paper makes an all - round study of progressive difference ratio construction and divides it into A, B, C and D variants. Furthermore, the reason is explained in cognitive category. Nontypical construction D has qualitative development and expresses ＂generalized non - difference ratio＂. Because the construction can＇ t be conducted from ＂ - M more than - M＂ construction, it is a more typical construction. The paper points out the origin of the construction change lies in lack of semantic grade.%借鉴构式语法理论的框架，对递进性差比义构式进行全面考察，将其分为A、B、C、D四种变式，并对各种变式之间的承继关系以及该构式的成因进行认知范畴的探索，给出合理的解释。非典型的构式（D式）发生了“质变”，表达“遍指性非差比义”，而这个构式义无法从“一M比一M”中推导出来，因而是更典型的构式。指出遍指性非差比义其质变的根源在于“量级序列”的缺失，“比”的原型义虚化，从“实比”演化为“虚比”。
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