[Purpose/significance] Librarians' diversity and teamwork are two important scales of ClimateQUAL^TM. The relation between the two scales has not yet thoroughly investigated. The paper uses the collaboration in the publications of the librarians of Nanjing Agricultural University library during the past 10 years to analyze Librarians' diversity in their collaboration. This analysis will provide evidence for the promotion of organization climate in libraries. [Method/process] The paper catalogs the librarians and their attributions such as age, professional titles, educational background, discipline background, position, etc., and then calculates the Simpson index and Entropy to measure the diversity of librarians. It draws the collaboration network to demonstrate the state of collaboration. [Result/conclusion] Using librarians as catalogues, Simpson index is 0.994, and the entropy is 0.6. Using the attributions of the librarians to catalog, the collaborators' Simpson indices are between 0.82 and 0.997, and entropies are between 0.59 and 0.89. The values of Simpson index are very high, while the entropy is relative low but is still larger than 0.59. The higher diversity may indicate the collaborations have conducted within different catalogues of the librarians but have not yet focused. The paper constructs the collaborative network and analyzes the strong links. It is found that the collaboration is still relatively loose, and the strong team has not been formed. Librarians with high education and high title are the important power to improve to performance of scientific collaboration. Although the subject backgrounds of librarians is wide, the library and information science is still the important factor to promote the output of research.