The interrogative pronouns concurrently have the meaning of objective reference and subjective pragmatic meaning in some special constructions. The dual meaning of interrogative pronouns come from the interactive of words and constructions: on the one hand the constructions make the words meaning close with the whole by suppressing, on the other hand the words absorb the meaning of constructions and in the end obtain the dual meaning. The interactive of words and constructions demonstrates the elemental viewpoints of semantic analysis: the semantic research should be taken by combining the words and the constructions, the special word meaning is the meaning of objective reference and subjective pragmatic meaning.