Abstract: Research on peak oil has extended to peak fossil fuels,now research on peak fossil fuels increases dramatically. Peak fossil fuels is the largest production and the time in one area.,it's the superposition of peak oil,peak natural gsa and peak coal. We demonstrate that the fossil fuels is objective all-round, then analyze and summarize the debate on peak fossil fuels. Finally, based n the world actual situation, we conclude that peak fossil fuels is coming and we must prepare for it.