As one of the settlements of the elderly in China, the aging problem is prominent, and it is of great significance to carry out the transformation of the public space of urban villages for aging. Based on the field investigation questionnaire, taking Chen officer camp community and new beach community, as an example, theory of SEM(structural equation model) was used to build urban public space aging evaluation system from security, convenience, comfort and participation. Amos software was used to summarizes the problems of public space. In order to optimize the public space of the elderly in urban villages, transformation strategies are proposed from the entrance space, street space, square space and idle space, which will provide reference for the reconstruction of urban villages in Lanzhou.