【Objective】According to the International Plant Protection Convention (IPPC), it is estimated that soil carbon loss contributes to the global atmospheric CO₂ concentration by about 30%~50%, and about 50%~70% of the loss is caused by soil erosion. Therefore, the loss of soil carbon through soil erosion has an important impact on carbon recycling and exchanging between terrestrial ecosystems and the atmosphere, and it plays a significant role in balancing the global CO₂ concentration and climate warming. Most studies on nutrient loss in China focus mainly on that in the loess plateau region and the purple soil region and pay attention mainly to nitrogen and phosphorous loss or TC loss with slope surface runoff, but almost neglect effects of the two factors, slope gradient and rainfall intensity, on TC loss with interflow in soil, let alone dynamic process of TC loss distribution in slope surface runoff and interflow. Therefore, this study was done to explore characteristics of soil total carbon (TC) loss with slope surface runoff and interflow on bare slopes of the soil derived from weathered granite in the Zhejiang-Fujian hilly region, China.【Method】 In this study an artificial rainfall simulation experiment was carried out to explore TC loss with slope surface runoff and interflow and its processes as affected by slope gradient and rainfall intensity and to analyze effects of the two on TC loss. So it was designed tot have 3 levels of rainfall intensity (60, 90 and 150 mm•h^-1) and four levels of slope gradient (5, 8, 15 and 25°), performed on two three-dimensional monitoring simulator runoff flumes, arranged in parallel. TC loss from each flume was monitored and calcuated.【Result】Results show that variation of the TC loss process with slope surface runoff was not much affected by slope gradient or rainfall intensity, and the TC loss rate variation curve was extra-significantly correlated with the mass concentration curve. That is to say, TC loss rate was affected mainly by TC mass concentration. In soil interflow, TC mass concentration curve peaked up rapidly and then declined and leveled off. In the experiment, TC loss with runoff increased with rising rainfall intensity, regardless of slope gradient, while TC loss with interflow decreased. No apparent linear relationship was found between TC loss with runoff and slope gradient under high rainfall intensities, while a linear relationship was looming between slope gradient and TC loss in the interflow. The influence of rainfall intensity on total TC loss and TC loss with runoff was more significant than that of slope gradient, but a reverse trend was observed in interflow. TC loss with runoff was found to be significantly and linearly related to rainfall intensity, slope gradient and runoff volume per rainfall event, with R² being higher than 0.800. 【Conclusion】In summary, TC loss increases gradually with rising slope gradient and rainfall intensity. Slope surface runoff is the main factor affecting TC loss, but interflow is one that can not be ignored. This study provides a calculation method for estimating TC losses with surface runoff on bare slopes of the soil derived from weathered granite in the Zhejiang-Fujian hilly region, China.