The properties of the silicon slot microring resonator with feedback waveguide are researched. Slot waveguides are integrated into microring resonators in order to enrich the fun ctions of the silicon waveguides and provide methods for advanced optoelectronic devices. T he taper structure is used to transform the optical power from traditional waveguide to slot waveguide ,which can decrease the transmission loss . T he op tical power distribution and mode transform ing process are studied by using finite difference in time domain (FDTD) method. Results show that the power is transformed into the slot s around the tape r adiabatically ,and forms the transmission mode of the slot waveguide finally . A n e xcellent m ode transforming efficiency as high as 90% can be achieved by optimizing the taper design. A slot microring resonator with feedback waveguide is fabricat ed on SOI wafer by using electron beam lithography and plasma etching technologies. Experiment results show that t he optical transmission and the mode transforming in the slot device are successful . T he index of the slot is changed by spin coating electro - op-tic polymer into the slot. M easurement s show that the shift of the peaks of the spectrum is as large a s 5.6nm . T he device shows a good tunable property. I t can be developed into tunable optical filter,optical modulator and biosensor .