The center of polity and ecomomy is detached in Ming Dynasty and Qing Dynasty。The provisionment of royalty，official and soldier absolutely dependes on the commissariat that carried from south to north by Canal，the carried commissariat is the economic base that depended on by Ming Dynasty and Qing Dynasty，but the carried commissariat is carried from south to north by Canal that from Beijing to Hangzhou，Tianjin is the hinge of Canal，it leads to Beijing northward and connects Changjiang-Huaihe southward，there are numerous sails that carrying commissariat pass Tianjin，indeed much carried commissariat uninstalls and stores up in Tianjin，so Tianjin is the key of the course of carrying commissariat in Ming Dynasty and Qing Dynasty，and is holded the balance in the history of carrying commissariat，carrying commissariat through Canal is one of the important factor for the development of Tianjin in Ming Dynasty and Qing Dynasty。This paper tries to in the round and amply discusses the crics of carrying commissariat about Tianjin in Ming Dynasty and Qing Dynasty。
The paper includes seven chapters，adding introduction and eplioque，it is in all nine seqments。
The main content of introduction reviews the research of former scholars，and accounts for the basis and research confine of this paper，as well as other correlative issues。
The first chapter mainly discusses South and North Canal in Tianji。This chapter mainly comprise the fountain and management of South and North Canal，the means and expense？of maintenance。In addition？，this chapter still discusses the circs of dredged and maintained about the canal of Jizhou。
The second chapter mainly discusses the carried commissariat that passing and uninstalling in Tianjin in Ming Dynasty and Qing Dynasty，respectively statistics and analyses for them，otherwise，discusses still the reasons that uninstalling carried commissariat in Tianjin and ultimately purpose。Finally，discusses also the carried commissariat that carried to Jizhou。
The third mainly discusses the especial matter taking place in Tianjin about the sail that carrying commissariat，for example，the sail is hastened，carried commissariat is freezed，drifted and scarcity，and discusses relative system aiming at these issue by government of Ming Dynasty and Qing Dynasty。
The fourth chapter mainly discusses the carried commissariat by sea，treats the thing about carrying commissariat through sea is implemented at long intervals under giving priority to Canal，stressly introduces the thing implemented in the sixth year of Daoguang。
The fifth chapter mainly discusses the commercial effect on Tianjin of carring commissariat by Canal。Mainly discusses the species and quantity of southern？autochthonism that carried into Tianjin by the sail that carrying commissariat，and the stimulative function on commercial flourish of Tianjin，and other trade rise。
The sixth chapter mainly discusses the culture effect on Tianjin of carring commissariat by Canal。Include the effect of language，belief，literature，literary and so forth。？
The seventh chapter mainly discusses the effect on Tianjin’s population，city layout，life of carring commissariat by Canal
Epilogue summarizes the main content of this paper through concise language，ang gives readers clear impress。
Key words：Ming Dynasty and Qing Dynasty；Tianjin；Carrying Commissariat by Canal