Although "wh"-words generally stay in situ in Chinese "wh"-questions, they can be topicalized. However, the "wh"-topicalization is determined at the syntax-discourse interface and has to be governed by discourse conditions; only discourse-linked (D-linked) "wh"-words can be topicalized, but non-D-linked ones cannot. This article reports on an empirical study that investigated English speakers' second language (L2) acquisition of Chinese "wh"-topicalization. The results of an acceptability judgment test indicate that advanced English speakers are sensitive to the discourse condition that governs the syntactic derivation of "wh"-topicalization in Chinese, as they were found to be able to make the distinction in their L2 Chinese by allowing D-linked, but not non-D-linked, "wh"-elements to topicalize. However, these results also indicate that "wh"-determiner phrases (DPs) and "wh"-noun phrases (NPs) differ in their sensitivity to presupposition background information in L2 Chinese "wh"-topicalization, and it is argued that the availability of the deictic feature in the "wh"-element involved is a variable affecting the D-linking properties of "wh"-elements in the development of L2 Chinese "wh"-topicalization, and this seems more likely to be a representational deficit than a processing problem.