In order to reveal the influence of rain intensity on nutrient losses from Karst bare slope, characteristics of runoff nutrient loss on Karst bare slope under different rainfall intensities were studied through artificial rainfall experiments based on simulating Karst bare slope in a steel tank with the adjustable slope and degree of underground holes (cracks). In each experiment, the tank was filled with soils and rocks. Results indicated: (1)Surface runoff didn’t generated on karst bare slope under 15 and 30 mm/h rainfall intensities, however, the surface runoff was yielded when rainfall intensity increased to 50 mm/h, and the underground holes (cracks) produced runoff under any rainfall intensity. (2)In the case of surface runoff, the amount of total nitrogen (TN) and total potassium (TK) loss increased with the rainfall intensity, however, the amount of total phosphorus (TP) loss first increased and then decreased, in the case of underground holes (cracks) runoff, the amount of TN loss first increased and then decreased with the rainfall intensity increasing, the amount of TK loss was positive correlation with rainfall intensities while the amount of TP loss was insignificant correlation with the rainfall intensity. (3)When rainfall intensities were 30 and 50 mm/h, the nutrient loss was dominated by underground hole (crack) loss, and its contribution was 100%, the contribution of TN loss in underground hole (crack) runoff presented the order as 15 mm/h＞30 mm/h＞50 mm/h＞70 mm/h＞90 mm/h, and the order of TP and TK was 15 mm/h＞30 mm/h＞50 mm/h＞90 mm/h＞70 mm/h. (4)Both the runoff volume, TN loss, TK loss in surface runoff and the TK loss in underground holes (cracks) runoff had significant positive correlation with rainfall intensity and its correlation coefficient were 0.926, 0.919, 0.982 and 0.955 respectively. Runoff nutrients loss only through the underground holes (cracks) when the rainfall intensity was 15, 30 mm/h, as the rainfall intensity≥50 mm/h, accompanied with surface runoff loss, and the amount of underground nutrient loss was greater than that of surface nutrient loss.