In order to study the effects of forest land and rain intensities on the phosphorus loss regulation in subsurface runoff, the typical Quercus acutissima forest, Robinia pseudoacacia forest and Quercus acutissima-Robinia pseudoacacia mixed forest in hilly area of middle southern Shandong Province were selected as the research objects. And simulated artificial rainfall experiments were carried out. The results showed that:(1) Subsurface runoff accounted for 36.16%~46.93% of the total runoff in forest, and for 18.58% in grassland. The rainwater infiltration capacity was higher in forest land than that in grassland, and the mixed forest gave the highest rainfall infiltration capacity. With the increase of rainfall intensities, the proportions of subsurface runoff decreased from 54.34% to 37.62% in forest. (2) TP losses with subsurface runoff in forest were only 45.88%~63.25% of those in grassland. Total TP losses in forest land were 55.32%~77.43% lower than thoseof grassland. Compared with grassland, the control effect of phosphorus in forest land was better, especially for the mixed forest, which gave the best control effect on phosphorus loss. With the increase of rainfall intensities, TP losses with subsurface runoff in forest increased by 0.68 times to 1.33 times. (3) TP losses with subsurface runoff accounts for 12.12%~25.00% of the total TP losses in forest and grassland. TP losses in subsurface runoff occupied the certain proportions of the total TP losses, so the subsurface runoff could not be ignored in TP loss control. With the increase of rainfall intensities, the proportions of TP losses with subsurface runoff decreased from 30.66% to 10.62% in forest. These findings could provide important reference for phosphorus loss control in forestland and the improvement of ecological environment.