As world-wide concern for the global warming continues to grow, the roles of sinks and reservoirs on greenhouse gas in forests are receiving greater attention. To evaluate these roles in forests, we require detailed accurate information on the amount and structure of forest resources, especially aboveground biomass. Therefore, the importance of airborne LiDAR (Light Detection and Ranging) is increasing as a tool to obtain such information. This paper reviews the primary techniques for evaluating forest resources using airborne LiDAR.