Abstract: This paper studies the relations between import trade and the technology progress of manufacturing industry in round-Bohai-sea region from the perspective of knowledge spillovers. Through empirical research on the relationship of import trade, domestic R&D input and manufacturing industry from 1999 to 2007 in the five providences of this region，We come to the conclusion that knowledge spillovers based on import trade play a positive role in the progress of manufacturing technology. But due to different trade openness and human capital in the five provinces, the effects of knowledge spillovers are vastly different in various regions. Some provinces should adjust trade policies and strengthen the construction of the talent groups to promote the absorbing ability of knowledge spillovers.