For　digital　control　systems　consisting　of　a　continuous　plant　and　a　digital　controller,　the　existing　stable　multi-rate　sampled　output　linear　feedback　controller　design　method　is　extended　from　linear　systems　to　nonlinear　systems.　The　corresponding　nonlinear　output　feedback　controller　and　nonlinear　systems　with　perturbation　are　investigated　too.　Stabilizability　and　robustness　conditions　for　such　nonlinear　multi-rate　sampled　output　feedback　control　systems　are　derived.