A TLC-visible spectrometry method for the determination of oleanolic acid in stem of Luffa cylindrica (L.)Roem and its processed product (stir baked to brown or charred)was reported. The method was carried out on thin layer plates of silica gel G with chloroform methyl-alcohol (10: 1)as the developer,and visible absorbance of the eluate was determined at 450 nm. The method showed good linearity(r<-i>=0.9998,n<-i>= 5)average recovery was 99. 52%,and RSD was 1.05 %. Results showed that the Oleanolic acid content in the stem of L. cylindrica and its processed product was not distinctly different from each other.