Idealization second quantization of composite particles

A practical method is developed to deal with the second quantization of the many-body system containing the composite particles. In our treatment, the modes associated with composite particles are regarded approximately as in dependent ones compared with those of unbound particles. The field operator s of the composite particles thus arise naturally in the second quantizatio n Hamiltonian. To be emphasized, the second quantization Hamiltonian has th e regular structures which correspond clearly to different physical process es.