Recently Russian-Sino relations have reached the best level of cooperation. Today, a strong and increasingly stable bilateral entente seems to have emerged, but neither state`s future is mechanistically predictable. So, somebody has analyzed these questions carefully. We can analyze the change in relationship of two countries according to research the border dispute in Primorsky. This article will attempt to identify these questions and prospect the future of Russian-Sino relations. So, this research proposes these questions and explains and analyze as it follows. First, this research reviews the border dispute between Russia and China in Primorsky chronologically. Second, this research analyze how the border dispute have changed Russian-Sino relations. Third, the cooperation of Russian-Sino relations by these analyses is reanalyzed and the future of them is prospected.