This paper is to examine some aspects of topicalization and wh-construction in Korean Sign Language(KSL)through a comparative analysis to American Sign Language(ASL). It suggests that in KSL, there is not moved topicalization because grammatical marker, giving a very important influence to word order, does not east. And also wh-element should be in-situ, and the wh-element in final clausal position is a focus element which is base generated at head F of focus projection.