A more comprehensive and in-depth understanding of the urban form has been a long-term interest of urban morphology. Compared to a plan view, urban section helps to understand the three-dimensional shape of a city from a transection. As a linear graph, the section can be quantified with some indicators easily and accurately. However, a single section cannot adequately describe the entire urban form, and a series of sections are needed to construct a representation of it. In this research, we test two different series of sections: parallel series and rotational series. In the former, all sections are distributed in parallel at a certain spacing, while in the latter, all sections are rotated around a center point. Taking four different districts of Nanjing, China, as the cases, two series of sections are applied to implement the quantitative analysis of urban form. The different parameters are also analyzed by comparison to determine reasonable values. The results show that the both series are effective in representing the urban morphological characteristics with reasonable parameters. In addition, the rotational series section method has unique advantages in expressing the urban form in different directions.