The unbalanced development of preschool education in different regions severely hinders the process of universalizing preschool education in Mainland China. Using the method of cluster analysis, this paper examined the extent to which the development of preschool education varied in different regions, on the basis of the gross preschool enrollment rate, student-to-teacher ratio, percentage of preschool teachers with a college diploma or above, and per-child preschool education spending index in the year of 2011. This paper suggested 31 provinces in Mainland China be divided into three developmental tiers according to their developmental status of preschool education, and explored each tier's characteristics in their development of preschool education. One significant finding was that the regional disparities in the development of preschool education correlated with the regional economic disparities in Mainland China. (author abstract)