This study aimed to establish a CTL (Cut to Length) system in gentle terrain in Japan. Accordingly, ordinary and line thinning operations were analyzed using a small harvester and forwarder newly introduced from Europe. The productivity of felling and processing operations for ordinary thinning was 15.9 m^3/hour, based on a timber volume of 0.40 m^3/tree and a mean on-site run distance of 269 m, while that for line thinning was 21.1 m^3/hour with 0.57 m^3/tree and 301 m of running. The productivity of the forwarding operation for ordinary thinning was 4.1 m^3/hour with a mean forwarding distance of 406 m (including 135 m running in the site to correct logs), while that for line thinning was 3.8 m^3/hour with 503 m of running (232 m). Accordingly, the labor productivity of this CTL system for ordinary thinning was 3.1 m^3/man-hour, and that for line thinning was 3.1 m^3/man-hour.