  Determinations of the couplings of $N N (n \pi) (n \geq 1)$ are reported. The
study is based on both a quark model of nucleon and a chiral field theory of
mesons. The coupling of $N N \pi$ is predicted and is in agreement with current
value. It shows that the coupling $ N N 2 \pi $ is resulted in the nature that
pion is a Goldstone boson. The couplings of $N N (n \pi) (n \geq 2)$ are
predicted by this approach.
