The year from 2008 to 2012 is the first commitment period of Kyoto Protocol.　Japanese government has planned to do thinning of abandoned artificial forest (3.3 M ha) to promote carbon fixation by the forest. However previous studies have shown the increase in soil respiration (SR) rate with the increase in soil temperature. In the present study the change in the SR rate before and after the thinning of a Cryptomeria stand was examined, and the factors related to the SR were also studied. A study site of cypress of 24 years stands was set at Mt. Yunodake, Fukushima pref., Japan. A quadrat (30m x 50m) and a total of forty eight sub-quadrats (5m x 5m) were placed in the quadrat where ten measurement points of SR rate were selected considering the micro-topography. It was measured every month by the ACE station (Bioscientific Co. LTD). Thinning was done in October 2011 in a half size of the quadrat. SR rate showed a good dependency on soil temperature before thinning period (June 2010 to October 2011) with a positive correlation (r=0.797, n=140). Soil moisture and SOM contents were not correlated with SR rate. Annual SR rate before thinning was 4.74 (C-t/ha/yr). After thinning it was increased although the difference was not apparent in soil temperature between thinning and non-thinning sub-quadrats, indicating the necessity of studies on other factors including soluble SOM.