我国许多城市扩张式的城市化进程导致了过度依赖小汽车和交通拥堵等问题。如何通过建成环境的优化来鼓励职工在本地区内工作和减少跨区通勤仍有待探索。现有的职住平衡测度指标没有对区内通勤和跨区通勤分开考虑，也没有考虑到跨区通勤距离，而且受到可塑性面元问题的影响。本研究利用就业活动自足性从另一个视角对职住平衡进行测度，包括职工区内通勤比例和跨区通勤距离两个方面。利用手机信令数据来分析在上海主城区和新城，建成环境对就业活动自足性的影响。首先，利用手机信令数据挖掘职工的就业活动和通勤模式。然后，构建就业活动自足性的指标体系，并使用不同空间分析单元来测度就业活动自足性，研究如何从职工选择非机动化通勤方式的意愿出发选择合适的空间分析单元。最后，探索建成环境包括混合利用和密度对就业活动自足性的影响。本项目将为如何通过建成环境的科学规划提高就业活动自足性提供理论和技术基础，对城市尤其新城的可持续发展具有重要意义。

In many Chinese cities, the urbanization process is dispersed development, which has led to urban problems including automobile dependence and traffic congestion, etc. To what extent mixed use and high density are able to encourage workers to work locally remains to be explored. Existing jobs-housing balance indices have not considered intra-zonal commuting and inter-zonal commuting separately, and have not taken commuting distance into consideration. The analyses of jobs-housing balance are affected by the modifiable areal unit problem. In this study, self-containment in employment is used to measure jobs-housing balance from a new perspective, which includes the percentage of workers who work locally and inter-zonal commuting distances. This study uses mobile phone signaling data to analyze the effects of mixed use and high density on self-containment in employment in the central areas and new towns of Shanghai. First, mobile phone signaling data are used to discover workers’ commuting patterns. Then, the index of self-containment in employment is examined, and used to measure self-containment in employment with different spatial analysis units. An appropriate analysis unit is selected based on workers’ willingness to choose non-motorized travel modes. Finally, the effects of mixed use and density on self-containment in employment are examined with an appropriate analysis unit. The research will supplement the existing literature and enhance our understanding of how mixed use and high-density development could encourage high self-containment in employment. It is of great significance to urban sustainable development especially for new towns.