17 hydrological stations located in the Taizi River basin were selected to investigate the relationship between landscape patterns and runoff using Ueographic Information System(UIS).Based on landscape patterns (landscape-level and class leve),landscape pattern index analysis and statistical methods were used to analyze the effects of landscape patterns on runoff.Results showed that the influence of landscape patterns on runoff was significant.At landscape level,the mean fractal dimension index(FRAC_MN),the median contiguity index(CONTIU_MD) and the interspersion and juxtaposition index(IJI) were the main pattern indices effectively affecting the runoff change.At class level,the patch diversity of dry land,the mean fractal dimension index(FRAC_MN) and the cohesion(COHESION)of dry land and residential construction land,the perimeter-area ratio variation coefficient(PARA_CV) and aggregation index(AI) of forest land and dryland,the median contiguity index(CONTIU_MD) and interspersion and juxtaposition index(IJI) of residential construction land were the main landscape pattern indices controlling the variation of runoff.Further-more,the perimeter-area ratio(PARA_CV) and the aggregation index(AI) of forest land were positively related to the change of runoff.