This paper investigates the dissipation and stability of switched nonlinear differential algebraic systems. First, a novel dissipative Hamiltonian realization of switched nonlinear differential algebraic systems is put forward. Then, we discuss the characteristics of the dissipative property of series, parallel and feedback interconnected switched nonlinear differential algebraic systems. It is shown that the dissipation property is invariant under parallel and feedback interconnection. Finally, by using Hamiltonian functions of the relative subsystems as multiple Lyapunov functions, we propose some sufficient conditions for the stability of dissipative switched nonlinear differential algebraic systems.