Abstract: High proportion of power electronics and renewables facilitates significant changes in the power grid structure and dynamic characteristics. The problem of wide-band oscillation caused by the interaction between power electronics and power grid becomes more and more prominent. First, the phenomenon, characteristics and analysis methods of wide-band oscillation are described in this paper. The advantages and limitations of different analysis methods are summarized. Secondly, the existing research is sorted out from three aspects, namely, generation mechanism, identification, and suppression of broadband oscillation. The key factors affecting the wide-band oscillation of AC-DC power grid are summarized. On this basis, the generation mechanism of wide-band oscillation in the scenario where new energy is sent out through AC-DC power grid is analyzed. Thirdly, according to the source of oscillation data (sub station and master station), different modal parameter identification methods are described. Then the differences and progress of existing identification methods are analyzed from the perspective of applicability. Fourthly, according to the different installation locations of the suppression devices (source side and network side), the research status of wide-band oscillation suppression measures is summarized. Finally, the prospects in dynamic modeling and oscillation formation mechanism of equipment, on-line detection and identification of wide-band oscillation, adaptive fault tolerance and suppression are put forward.