Effective data management is the key link to promote the application of public safety data. Current researches have not yet formed an accurate definition of the development path and stage goal of public safety data management, and there is no theoretical model to evaluate the level of public safety data management of government organizations and related institutions. Based on the software Capability Maturity Model and the public safety data management process, this paper constructs the public safety data management Capability Maturity Model by determining key practices and key process areas and dividing the level of a capability maturity for public security data management.