[Objective] It is a foundational mechanism to indicate different impacts of artificial vegetation collocation on the runoff deepth and soil erosion amount at the side slope of mine dump in semi-arid zone.[Methods] Based on three artificial plant collocations(tree with shrub and grass, shrub with grass, and grass) and contrast plot(no vegetation), we employed statistics method to analyze relationship between the side slope erosion(including side slope runoff and soil erosion amount) and rainfall in daily scale from May to Sep. in 2014 and 2105.[Results] (1) For controlling effect of the runoff, tree with shrub and grass, and shrub with grass performed better in three types and its runoff amounts had no significant difference, their values were 42.9% and 52.6% of the contrast ones, respectively. (2) For the erosive controlling effect, no significant differences between the three types and the contrast plot were found, the amounts of the three types were 2.3%~6.7% of the contrast. There were linear relation between daily rainfall and the side slope erosion.[Conclusion] Vegetation collocations had better effects in erosive control than in runoff prevention, and over 93% of erosion control and 28%~57% of runoff prevention were obtained in comparison the corresponding contrast.