This review summarized some reports and data concerning of thermal conductive polymer composites, by focusing thermal interface materials (TIM). Here, we explained 8 factors to affect thermal conductivity of polymer composites, before introducing various types of thermal conductive models. And I discussed the enhancing methods of thermal conductivity of polymer composites in last century, after explaining the progress in thermal conductive resin and fillers. Then, I explained the methods developed by focusing how conductive fillers were connected. Finally, present and future in TIM were discussed in the several types of viewpoints.