because human resources are limited.

principle of factor usefulness. That is, in the process of human resource allocation, any essential personnel are useful. Principle of energy potential correspondence. That is to say, people with different abilities and levels should be placed in positions that require corresponding characteristics and levels, and be given the rights and responsibilities that this position should have, so that the personal ability level can adapt to the job requirements.

complementary value-added principle. It emphasizes the formation of overall advantages through learning from each other's strong points and realizing the optimization of organizational goals. Principle of dynamic adaptation. It means that the maladjustment between people and things is absolute, and the adaptation is relative. From maladjustment to adaptation, it is realized in sports. Therefore, we should constantly adjust the relationship between people and things to adapt. Principle of elastic redundancy. It requires that in the process of allocating people and things, it not only brings certain pressure and urgency to human resources, but also ensures the physical and mental health of all employees.