We discuss stochastic functional differential equation under regime switching dx(t) = f(xt, r(t), t)dt + q(r(t))x(t)dW1(t) + σ(r(t)) | x(t)|βx(t)dW2(t). We obtain unique global solution of this system without the linear growth condition; furthermore, we prove its asymptotic ultimate boundedness. Using the ergodic property of the Markov chain, we give the sufficient condition of almost surely exponentially stable of this system.