中文摘要：

可达性是城市规划、土地开发、房地产投资、交通管理等领域必须考虑的重要因素。论文结合乘坐北京市地铁更关心转换次数的特点，采用空间句法中平均深度值的形态分析变量，对2008年北京市各地铁线路、各起始站、各换乘站的可达性做了数量化的评价。评价结果表明，（1）空间句法是一种适于按线路单一票价计费的地铁评价方法；（2）基于空间句法的北京各地铁线路的可达性评价较为宏观、粗糙，而空间句法的北京各地铁起始站、换乘站的可达性评价则较为微观、精细；（3）2008年北京地铁的规划充分考虑了中关村地区、亚奥地带、西单、东单等地区旺盛的交通需求；（4）与市内其他地铁线相比，8号、9号地铁线的可达性较差，使用率可能会较低，建议结合OD流调整班次或车长，以降低运行成本。

英文摘要：

Accessibility is an important factor in urban planning, real estate development and traffic management. According to the characteristics of Beijing＇s subways that the passengers usually cares about the transfer times rather than traffic distance, this paper used the average depth value of spatial syntax to quantitatively evaluate the accessibility of Beijing＇s subways in 2008. The evaluation results show that 1 ） the evaluation method based on spatial syntax is reasonable to measure the accessibility of Beijing＇s subways; 2） the evaluation results about each subwayline are more macroscopical and coarse, and the evolution results about starting/terminal station and transfer station are more microscopical and elaborate; 3 ） the plan about Beijing＇s subways in 2008 takes into account the bloomed traffic requirement on some keys districts, for example, Zhongguancun district, Yayuncun and Aoyuncun district, Xidan district and Dongdan district; and 4） compared with the other subway lines in inner city, the accessibilities of No. 8 and No. 9 lines are worse for the accessibilitise of the subways are closer to suburbs, therefore rational running plans should be made according to the OD flow, for example, to adjust the number of carriage, number of runs.