OBJECTIVES: Data on health services utilization of urban residents collected through random-sampling household surveys are analyzed to access the equity of health service utilization of urban residents in western China. METHODS: Variable of Health Need of urban residents is standardized through Logistic Model, Negative Binomial Model and Possion Model. Residents are divided into 5 groups by per capita annual income in families, and parallel equity of health service utilization is assessed by calculating Concentration Index (CI) and mean-value and difference testing among residents of different income levels. While residents are divided into 8 groups by ages, and vertical equity is evaluated by calculating Index of Dissimilarity (ID) among residents of different ages.  RESULTS: On outpatient service utilization, Standard CI of two-week outpatient visiting rate, two-week outpatient visiting times, outpatient expenditure and its compensation level are -0.0040, -0.0115, 0.0244, 0.2356 respectively, while ID of the four indexes mentioned above are 0.2709 (P<0.05), 0.3285 (P<0.05), 0.3434 (P<0.05), 0.3785 (P=0.5489) respectively. On inpatient service utilization, Standard CI of annual hospitalization rate, annual hospitalization times, days of hospitalization, inpatient expenditure and its compensation level are 0.1110, 0.0200, 0.0260, 0.0336 and 0.1449 respectively, while ID of the five indexes mentioned above are 0.3139, 0.3408, 0.3814, 0.4397, 0.4691 respectively (P<0.05).  CONCLUSIONS: Equity of outpatient service utilization is poor in that urban residents with low-income or over the age of 65 get fewer outpatient compensation fees, while equity of hospitalization service utilization is weak in that low-income urban residents use fewer hospitalization services and get less hospitalization compensation fees, and that urban residents over the age of 65, who is in most health service demand, can neither get the most hospitalization services nor receive a higher proportion of hospitalization compensation. Comprehensive measures should be taken to improve the equity of health service utilization in urban residents who are old-aged or come from less well-off families.