Abstarct: In this thesis we have introduced the new version of plassma environment classical and quantum plasma. we obtained the magnetohydrodynemic (MHD) equations for quantum plasma system. and studied the linear and nonlinear spin effects in quantum magne tohydrodynemic system. In the nonlinear limit by using (RPM) method the governing equations for spin-1/2 quantum magnetohydrodynemic system was obtained. The solu tion of (KPB) was analyzed by (tanh) method.