Rhodotorula　sp.,　one　of　the　common　yeast,　was　able　to　degradate　the　Nonylphenol　in　liquid　culture.　The　effect　on　degradation　of　Nonylphenol　in　soil,　and　the　effect　of　the　co-treating　with　the　aboriginal　microorganis　was　studied　under　different　conditions.　The　result　showed　that　the　proceddion　of　Nonylphenol　degradation　in　soil　fitted　the　first　order　reaction　kinetices　model　(the　correlation　index　r2　0.9),　and　the　degradation　rate　of　adding　Rhodotorula　sp.　in　the　soil　can　make　the　best　effect.　We　also　studied　the　bioremediation　of　the　Nonylphenol-contaminated　soil　by　the　Rhodotorula　sp　At　the　large　density　pollutant　(44　mg/kg　dry　soil),　adding　the　Rhodotorula　sp.　had　no　obvious　intensification　on　bioremediation,　but　at　the　lower　density　pollutant(2.211　mg/kg　dry　soil),　adding　the　Rhodotorula　sp.　obviously　increased　the　degradation　rate　of　Nonylphenol.　Therefore,　the　Rhodotorula　sp.　is　applicable　to　the　bioremediation　of　polluted　soil　of　low　and　medium　density　pollutant.　©　2011　IEEE.