Abstract: On the basis of the sustainable development of Bruntland definition,discuss on some theoretical issues were studied in this paper,which including types of sustainable development, indicator system of sustainable development,principles sustainable development and models of sustainable development.Firstly,according to standardized understanding of sustainable development,the types of sustainable development should be classified to provide the basic schedules for other study.The administrative division should be the first-class dividing- indicator,the county level as the basic adminidtrative unit for the aim of sustainable development;the business or resources should be selected as the second-class dividing-indicator depending on the characteristics of region.The aim on indicator system of sustainable development is to assess the capability and the extent of sustainable development on the county level,the key step is how to select the inducators indentifying the properties and relationship among the four subsystems,population,resource,environment and development,and how to set up the right mathematics models to reflect the coordination operation.Principles. Coordination action of sustainable development provides the theoretical bases for setting up the models of sustainable development.The mathematics models would be set up to study the coordination action,which makes the cybernetic operation among the four sub-systems the center,and the mechanism of the coordination operation would be reflected by the way of mathematics simulation.Modes of sustainable development are the essential aims of research on sustainable development,which representing the series models on the studied areas,including the three types models on two levels,the general model dealing with the relationship among the four sub-systems,the business or resources models advancing the concrete resources arrangement among the business or the business arrangement among resources,and the ensuring models putting forward some scientific,theological and administrative suggestion for sustainable development.

Key words: sustainable development, theoretical issues