In order to investigate the mineral nutrition characteristic of Oncidium,a detailed observation on each growth periods was done during 2009～2011.The accumulation,absorption and distribution characteristics of dry biomass and mineral elements in different organs of Oncidium Gower Ramsey ‘Gold 3’were studied.The results showed that the total dry biomass of Oncidium were 242 g/plant in seedling stage,1504 g/plant in initial bloom and 5057 g/plant in bloom stage,the largest proporation were leaves.Great demand of potassium(K)in Oncidium Gower Ramsey ‘Gold 3’ which had the highest distribution of potassium(K)in leaves each stage.The calcium(Ca)and nitrogen(N)were highest in the leaves.The phosphorus(P)and magnesium(Mg)and sulphur(S)were highest in leaves and pseudobulbs followed by potassium.The N∶P∶K absorption ratio was 1∶041∶157 in seedling stage,1∶027∶145 in initial bloom and 1∶031∶162 in bloom stage.To attain a flower,orchid must uptake 418 g dry matter,N 8976,P 1091,K 7044,Ca 833,Mg 743,and S 731 mg.