Simulation study and experiments of an integrated orbit feedback system of the combined slow and fast correctors is under way. The slow correctors have the stronger trim strength with slower response while the fast ones have weaker strength but faster response. The integrated system can transfer DC corrections smoothly from fast correctors to slow ones to avoid possible saturation of the fast correctors as well as has an advantage of capability to suppress fast transient orbit drift. The simulation of the system performance will be presented and its application for TLS and TPS will also be discussed.