There are abundant germplasm conservation of Catalpa fargesii Bur. in China, but only a few of which have been used in improvement programme. Establishing a core collection of Catalpa fargesii Bur. can enhance utilization of genetic resources in research programme. Using 267 accessions of Catalpa fargesii Bur. as test materials, 15 morphological traits were carried out, then principal components and cluster analysis were performed. The results were used to evaluate the morphological diversity of Catalpa fargesii Bur. germplasm resource. Moreover, basing on geographical distribution and phenotypic data, sum of squares method and Euclidean distance were used to perform hierarchical cluster, and 63 accessions of core collection were constructed preliminarily, accounting for 23.6％of the total 267 accessions. The results showed that genetic diversity of the 63 core collection had no significant difference with total accessions, which mean that the 63 core collection of Catalpa fargesii Bur. could represent the genetic diversity of the tota1. This lays foundation for study, effective use and conservation of Catalpa fargesii Bur.to some extent.