Inextricably bound to good service trade, high added value and high-tech, these features determines knowledge-based service trade having a negligible impact on employment. This paper studies the effect of international knowledge-based service trade on employment and it get the conclusion: the export of knowledge-based service trade has promoted the growth of employment’s scale, while the import has negative effects on employment’s scale. Finally, tying in knowledge-based service trade’s features, this paper put forward some policy recommendations for optimizing the positive effects of knowledge-based service trade.