Semantic priming refers to a tendency that language processing is facilitated in case that words are semantically related to each other due to a language user’s knowledge and prior experience. Hence, semantic priming can be considered as a tool to assess language processors’ implicit index of semantic relatedness. The purpose of the present study is to investigate 1) whether teenaged EFL learners will show semantic priming effects on gender category perception, 2) whether there are any different effects between immediate and delayed prime conditions, and 3) whether there are any different effects between gender stereotype and suffixtype words. As a result, semantic priming effects were observed in general. Delayed prime condition showed stronger effects than immediate prime condition and feminine suffix-type of words showed robust effects than any other types.