A racetrack resonator filter is fabricated by Ag⁺-Na⁺ ion-exchange technique in K9 glass. The free spectrum rang (FSR) and contrast ratio (C_r) of the resonator are tested to be 0.177 nm and 7.5 dB. With fitted results,the coupling ratio is κ=0.916,the loss factors of the coupler and the resonator are δ = 0.55 and γ = 0.48,respectively. The relative large losses of the waveguide device are due to the almost connection of the coupler waveguides,irregularity of the strip waveguide side and flaw of waveguide surface after one-step ion-exchange. By decreasing loss,this integrated waveguide resonator filter may be used in optics communications or sensing fields and can be combined with other waveguide structures to perform further functions.