Vehicle trip generation and attraction relate to the land use of traffic zones closely. Land use can be described with a series of economic and technical indexes. But some indexes are hardly obtained in practice, so th.at it is difficult to give the completed land use description, to model and to forecast. This paper introduces the concept of land use utility which can reflect the land use of a iraffic zone comprehensively with some available statistical figures. A practical application of the land use utility in urban traffic planning shows in the paper.