An experiment was carried out to determine the effect of dietary organic acids (Fumaric, lactic and phosphoric acid) mixture (AH) supplementation to commercial diet on performance and egg quality of laying hens. 320 Hisex Brown laying hens at the beginning of laying age (20 weeks of age) were randomly distributed in a completely randomized design experiment, with 4 treatments and 20 replicates (each replicate consisted of 4 birds/pen). Treatments used AH0: Basal feed + 0% AH in diet (control); AH0.1: Basal feed + 0.1% AH; AH0.15: Basal feed + 0.15% AH; AH0.2: Basal feed + 0.2% AH. Variables observed were feed intake, hen day production, egg quality, unnormal egg and E.coli contents in feces. The results revealed that no effect of AH on feed intake, egg weight but a little improvement hen day production and feed conversion ratio in AH0.1 and AH0.15 diets compare to control and AH0.2 groups. The 0.15 and 0.2% AH supplement diet showed lower proportion of broken, unnormal and doubleyorkeggs compared with control group. There were no significant effect of treatments on egg shape index, shell weight, shell thickness, albumen weight, Haugh Unit. But there was a light improvement of albumin index and yolk color in supplemented groups compared with control group. Howerver, the E.coli content in feces were decreased in AH supplementation diets compared with control group. The conclusion of this experiment is adding AH product at 0.1% could lightly improve hen day production, feed conversion  ratio and reduce E.coli in feces but not with egg quality of commercial laying hens.