This paper discussed the construction polysemy and the construction expansion based on previous study about individual constructions. The construction has its construction meaning, which can be extended from central sense to expanded sense. We can explain polysemy of the construction through core meaning and meaning chains, like vocabularies. The construction can also be expanded under the influence of other constructions. The construction expansion can be divided into four types. First type is that two constructions have same form but their arguments are different. Second type is that two constructions have different form but their arguments are same. Third type is that two constructions have different argument but one construction is subpart of the other construction. Forth type is that two constructions have different form and argument, but they are metaphorically involved. Polysemy of some constructions can not be explained by core meaning and meaning chains, these constructions are influenced by expansion of the construction itself and external forces. The construction may be expanded with a complex influence from multiple constructions in the process of expansion. And some constructions have polysemy and construction expansion together. In conclusion, the construction polysemy and the construction expansion show complex aspects in which the constructions continue to develop as they interact with each other.