Abstract: Based on idealized cognitive models, this paper employs statistical learning method to probe into the cogntive models of “Wei X” construction. Analysis of elicited data indicates that firstly the conceptural structure of “Wei X” constuction is motivted by “Wei” ICM and Social Stereotype +productive by Wei, +meaningful by Wei, which brings about the composite cognitive model, characterized by + tiny, few, and slight in form, + related with micro-blog, + by micro-blog, +ultra-few in umber,+ultra-little in space, +ultral-short in time and +productive by Wei, +meaningful by Wei. Secondly, this composite cognitive model is developed jointly with prototype as a center, marginal CMs as untypical, and cutural variables +productive by Wei, +meaningful by Wei as controling. Prototype, untipical CM and controling varibles work together. On one hand, these three varibles do their own work, and take charge of different models’ prominence. On the other hand, these three varibles cooperate with each other, coincide with each other and correspond to different models’ prominent continuous changes, which brings about “Wei X” construction’s dynamic meaning distribution.