This article studies on economic development and social change trajectory of Tingzhou in Song and Yuan Dynasties,exploring the process to form the hakka core of the Tingzhou,mainly from the angle of National History,Economic and social history,History of immigration,History of the development of population,Historical Geography,and so on.The route from Fujian to Central China directly impacted on the basic direction and trend of northern migration to Fujian since Qin and Han Dynasties. West Fujian has been marginalized in the national power. Until Tang and Song Dynasties,its society and traffic were gradually developed. The waterway of Jiulong River had been opened in Tang Dynasty. It was more important than Ting river then. The waterway of Ting river did not open before Shaoding of Southern Song Dynasty. It was developed in the late of Southern Song Dynasty and laid the foundation for the opening of Chaozhou post road to Longxing in Yuan Dynasty. This post road made Tingzhou as a traffic center in Jiangxi and Fujian border.The development of transportation promoted the economic development in Tingzhou in Song Dynasty. Mining industry was a pillar industry of Tingzhou in Song Dynasty. In Southern Song Dynasty it was in the decline stage. In Yuan Dynasty,It almost stopped. Most people made a living with smuggling salt in Tingzhou in Southern Song Dynasty. As a result,the trade between money and grain developed and the social conflicts because of smuggling salt never stopped until Yuan Dynasty. During this period,various ethnic groups who lived here gradually formed a new group.The education had made great progress in Tingzhou in Song and Yuan Dynasties. It had a good education system. Neo Confucianism had made significant progress too. And it formed a culture circle of the Faith in Dipamkara. Educational development changed the social customs. It formed Unique and outstanding of the Hakka people.Tingzhou was not a peaceful place in history. There were too many social conflicts. These social conflicts caused minor damages in Northern Song Dynasty. But in Southern Song Dynasty they became a threat to local governments. To Yuan Dynasty,the unrest of Tingzhou has turned into a strong sense of national resistance struggle.The Hakka was initial formation in the Southern Song Dynasty. They fight against the Yuan Dynasty with The She nationality for long time until the demise of the Yuan Dynasty. In the process,The She nationality and The Han nationality formed merge with each other. This promoted the growing of the Hakka people. The Hakka people came the first development climax.