中文摘要：

针对国内城市交通小区划分多靠定性分析的情况，分析了国内外交通小区划分方法，提出了基于区内出行比例的交通小区半径定量计算方法。基于交通小区半径和出行距离的三种不同组合，推导出了相应的区内出行比例计算模型，利用Excel软件的VBA编程功能，进行了三者之间的数量关系计算，通过对区内出行比例的控制，得出交通小区半径的合理范围。实例计算结果表明：当区内出行比例范围为5％～10％时，西安中心市区交通小区的合理半径在0．7～1．1km之间，而实际调查区内出行比例为9．28％，交通小区半径为0．9km，调查值与计算值接近，小区半径定量计算方法可行。

英文摘要：

With regard to the problem that taffic zone was divided through qualitative analysis in domestic cities, traffic zone dividing methods were analyzed in foreign and domestic cities, a calculating method of traffic zone radius was presented based on considering inner trip proportion. The calculation models of inner trip proportion were educed under three combinations between trip distance and traffic zone radius. The quantitative relationship among traffic zone radius, trip distance and inner trip proportion was gained by using VBA programme of Excel software. The range of traffic zone was confirmed according to appropriate inner trip proportion. Computation result shows that rational traffic zone radius in Xi＇an ranges from 0. 7 to 1.1 km, its real survey value is 0. 9 km, inner trip proportion ranges from 5% to 10%, its real survey value is 9. 28%. Obviously, the computation values are close to the real survey values, the method is feasible. 4 tabs, 4 figs, 11 refs.