The sources of human resources information can be divided into the following categories.

According to the set of random variables output by the source, the source can be divided into discrete source and continuous source.

Human resource information can be divided into two categories: internal information and external environmental information.

Human resource informatization refers to highly automated human resource management based on the Internet, including core human resource workflow, such as recruitment, salary management and training. Broadly speaking, human resource informatization is all electronic human resource management based on the concept of e-commerce, including human resource management by using company intranet and other electronic means, such as employee call center.