Abstract: In this paper, with monthly U of the ECM WF data in Dec. 1982, Apr. 1983, Oct. 1984 and Apr. 1985, a nonlinear critical layer model is integrated The results show that, using the basic fluid U in Dec. 1982 and in Apr. 1983, 6. Its scope is big, the intensity of the subtropical hihg is strong and the sum maintains at two. The subtropical high moves westward. The period of oscillation is one or two months. On the contrary, in Oct. 1984 and Apr. 1985, the scope is small and the intensity is weak, the fluid field is like a band. The sum reaches four or six. The subtropical high breaks up or unites quickly and moves westward. It is known that from sept. 1982 to sept. 1983, there occurs an El Nino event; from oct. 1984 to sept. 1985 there occurs a La Nina event. The energy flux charts show that, the amplitude in El Nino is bigger than that in La Nina. It is then possible that the basic flow in El Nino can streng then subtropical high, and correspondingly, the basic flow in La Nina can weaken the subtropical high. These results are of importance for the research of the generation, maintenance and oscillation of the subtropical high.