It is necessary to introduce contract system to construction enterprises operation and management,so as to adapt to the further development of the market economy,raise the level of business management,increase enterprise benefit and construct socialism harmonious society.

It is a necessity of historical development, building a harmonious society and enterprise development to establish a contract system for private enterprises.

The Qing dynasty administrated folk contracts by way of contract taxation;despite of its focus of attention on the national taxation,it functioned as an affirmation of the folk contracts of real estate.

Both the Standard and the Nonstandard in the Tax Deeds of Land in the Middle of Hebei during the Late Qing Dynasty and the Early Period of the Republic of China;