Cetyltrimethyl ammonium bromide(CTAB) was attached on gold nanorods(AuNRs) as a stabilizing agent,which can enrich the plant polyphenolic compounds(HQ) on the surface of gold nanorods and lead to weaken the fluorescent intensity of gold nanorods by hydrophobic effect.When different polyphenolic compounds were added to gold nanorods system,the fluorescent intensity of AuNRs in 719 nm was decreased significantly.Under the experimental conditions of 20% methanol(pH 5.0-6.0),the fluorescent intensity of AuNRs as fluorescent probe was linearly related to the concentration of three polyphenolic compounds(mangiferin,daphnetin and resveratrol).In this way,a new method for the analysis of three polyphenolic compounds with sensitivity,simplity and quickness was established.The detection limits of three polyphenolic compounds were 5.0×10-8,8.0 ×10-8,2.0 ×10-7mol?L-1,respectively.