Abstract: High proportion of renewables and high proportion of power electronics gradually becomes a significant feature of the power systems. However, the wide-band oscillation resulting from the interaction between power electronics and the power grid is one of the important problems for power system stability. First, the influence of power electronic trend on power system oscillation was discussed, and the definition of wide-band oscillation was introduced in a broad sense. Secondly, wide-band oscillation was compared with the traditional oscillation of power systems. The morphological characteristics of wide-band oscillation were summarized, and formation mechanism were analyzed. Then, the present research status, including mathematical model, spatial-temporal characteristics and suppression measures were outlined, and then the existing problems and challenges in researching of wide-band oscillation were pointed out. Finally, the research approaches and methods of wide-band oscillation in renewables and power electronics highly integrated power systems were put forward from four aspects: modeling method, mechanism research, propagation characteristics and suppression measures.