The effects of converter control parameters of DFIG wind generation system on the oscillation modes were studied. A complete small signal model in MATLAB/Simulink was proposed. By using eigenvalue and participation factors analysis, the oscillation modes were discovered and classified. By altering the parameters of converter, the changes of oscillation modes were studied. Finally, simulation was done on the MATLAB/Simulink. The research showed that the oscillation could be suppressed by optimizing the control parameters of converter.