During the time course of establishing non-local syntactic relationships,the adult L2 learners’ interlanguage mechanism would also activate WH elements as variables and maintain their storage in the temporary memory, but would fail to construct mental representation for the intermediate gaps by way of successive cyclycity. This leads to the formation of contrasts between native representation and interlanguage representation. In terms of WH-dislocation, the present study obtains results through a self-paced reading design, which reveals the following behavioral pattern:sentence processing in interlanguage relies more on lexical semantic information, whereas less on structural information, thereby lending support to the Shallow Representation Hypothesis. Although displacement, as the inherent property of natural languages, receives crucial emphasis in recent theoretical inquiry, interlanguage grammar still lacks structural dependency, which well accounts for the lack of structural representation for WH elements and the insubstantial effects from L2 learners’ native language background.