In this paper, the expressions of the high-frequency and low-frequency nonlinear currents that leads to strong turbulence formation in plasma were found by using Kinetic theory. According to the system of equations in the reference 2 which included pondermotive force, self-generated magnetic field and their damping effects, we generalized the modulation instability analysis given by Kono et al. and obtained the expressions of growth rate parameter etc. in various cases while the longitudinal and transverse waves were excited by Langmuir or transverse pump waves. Finally, we discussed the collapse dynamics of wave packet and extended the collapse argument on nonlinear Schrodinger equation to the case of the density and field coupling equation system.