Abstract: Based on a review on preparations and applications of semiconductor/graphene nanocomposites, their excellent properties, such as lithium-ion battery with high properties, supercapacitors, solar cells with higher conversion efficiency, catalysts with higher photodegradation activities as well as sensors with higher sensitivity, exhibited in advanced energy storage designs, photocatalysts or sensors, have been elucidated. The possible development trends in the future including lower price-cost for material preparation, much more understanding of interaction mechanism between different materials and the relationship between compositions and properties, have also been suggested.