To initiate the study on consumers'behaviors in China, the authors, based upon quantities of questionnaires and field surveysin Tianjin, analyze the urban residents' shopping trip space. An aggregated ring shape of shopping trip space of Tianjin's residents, which also reflects the hierarchy of urban region, shows a decay in shopping space (distance) from the higher level merchandises to the lower ones, and prove that the 400 to 500 meters'radius of the trip space for convenient merchandises is applicable and boasts its common meanings throughout the world. More creatively, to describe and analyze the hierarchy of shopping trip space in detail and mathematically, a new mode, which is based upon Central Place Theory, is introduced, upon which some new details are found and analyzed. For the market segment, the authors cluster the residential cases into four groups by income levels, and bring out three kinds of hierarchical distribution of shopping trip space, which differentiates the income groups in shopping trip distance and the preference to the hierarchical central places and with some possible accounts for the structures followed.