Abstract: Various interpretations and definitions of “new economy” are described in the face of obvious ambiguities in current definition criteria． Changes in the form of economic relations in industries widely recognized as “new economy” are identified, key differences between “new economy” and traditional economy relate to production． The “new economy” industries involve series of changes on the form of production organizations and social relations． Such changes are represented mainly by a set of new elements in the level of relations to production that reflects the future form named by “joint economy”． According to these elements, the “new economy” industries can be clearly and strictly defined． The development level of these elements are used to further propose series of key indicators measuring development level of “new economy”．