[Objective] The quantitative characteristics, the survival condition and the spatial distribution pattern of Ailanthus altissima regenerated saplings were investigated and analyzed to provide theoretical bases for natural regeneration of arbor, human-induced disturbance regeneration, and other regeneration promotion in urban green space habitat.[Methods] Time-specific life table, paired correlation function G(r) and H(r) were utilized to analyze the seedlings' living conditions, the distribution pattern and spatial association among seedlings with different age classes.[Results] There was a fluctuation in the structure of Ailanthus altissima regenerated saplings' population. The individuals at young and middle age-class were abundant, and the type of survival curve of the population was regarded as Deevey Ⅱ. Lifespan's curve of mortality rate and disappearance rate all had a stable stage in the early and late period, while in the middle period, the two items experienced decrease and increase successively. Individual mortality and disappearance rates reached the top peaks beyond the 5th age-class(8~10 cm).[Conclusion] Regenerated saplings were significantly aggregated in different degree and the aggregation intensity weakened with the increase of scale in both two pavement's types. The type of one side's pavement seemed randomly distributed when the scale is close to 3.7 m. There is almost no correlation relationship at small scale, however, when scale increased, positive correlation relationships between seedlings of different age classes was detected. The closer the age class of the regenerated saplings was, the stronger the positive correlation was.