Many nonlinear interactions can be found in nature. One of the most frequently appeared interactions is the three wave nonlinear interation. In this paper, I investigate the nonlinear interaction among three waves. It is found that the system exhibits two kinds of different chaotic behaviors. One chaotic motion has tent map structure. The other has quadratic map structure. This paper suggests that the dynamics with tent map structure in this system is equivalent to chaotic motions in nonlinear oscillators.