The system concept is an important theoretical achievement in adapting Marxism to the Chinese context and the needs of the times,which was formed on system science and fine traditional Chi-nese culture.These conclusions are drawn by comparing contradictory thinking and systems thinking from a systems perspective.(1)Contradiction is a subset of difference,which is a larger set;(2)Not bipo-larity but multipolarity is the essential feature of the contradiction;(3)Unity means interdependence,while synergy is fundamental to development;(4)Harmony is the key to success,while struggle is only a means.