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The science and technology activities in China are rapidly growing since 90s. This paper analyzes the production of scientific papers and the factor of increasing papers, and Japan-China relationship in co-authored papers. The growth rate of papers production became the sixth place in the world, the world share of papers increased by more than three times, and the papers production has concentrated on priority universities since the implementation of the top priority policy (211 project). And in internationally co-authored papers, Japan-China relationship rapidly deepens in the high share fields such as chemistries, materials, physics and engineering, while in mathematics in which China exceeds Japan, Japan-China relationship is not strong. [ABSTRACT FROM AUTHOR]