Chrysanthemum ( Chrysanthemum× morifolium Ramat) from Asterveae family and carnation ( Dianthus caryophyllus L.) from Caryophyllaceae family are ameng. Production of high quality cut flowers is very important. Therefore, number of flower, flower color, diameter of flower and postharvest life of cut flower are of areaf importance. In marketing important cut flowers, beauty of some bright flowers that are in second rank sales in terms of marketability or have mild wilting, can be maximized by dying. Due to poor tonality of chrysanthemum, measures must be taken to improve dye absorption. In this study, optimization of flower tonality tests was done in order to evaluat the dye effect on qualitative properties and vase life of these two flowers. At each stage of treatment, the best treatment was selected and used at the next stage. This experiment was canducted as factorial based on a completely randomized design and traits of Intensity of flower tonality, Percentage including of flower tonality and the uniformity of absorbed dye were assessed and analyzed by SAS software and Matlab. During pretreatment, a drop of dye was placed on chromatography paper and silica gel and papers were placed in distilled water and extracts of flower stems and dye uptake were which checked. Then prepared flowers recoverd 24-hours water stress, than moved t screen the dye concentrations were in a wide spectrum (200-7100ppm) dye and two isotonic acidic and neutral pH. In next stage, two type of dye (edible and industrial) were. The results showed that the best edible dyestuff were Erythrosine and brilliant Blue. At the next step, powdery, liquid and gelatinous edible dye with the active surface substance (dishwashing liquid) were applied in cut flowers. The soluthions effect of cutting end of the stem based on diagonal and flat cut of the end of stem and longitudinal cut and scratching the skin surface of stem were examined. Then the effect of leaves and not bearing leaves being stem were assessed. From this step of experiments, in addition to visual examining the data (panel test), they were examined by reflectometer spectrophotometer, too. Microscopic observations showed that uptake of dye is done by simple diffusion in to parenchyma cells and type of xylems and their thickness affect the absorption and traort and release of the dye. The effect of light and darkness on flowers were investigated and also the effect of dye temperature (30,40, 50 ? C and refrigerator temperature) was assessed. Finally, the effect of ambient temperature (25 ? C) and residence time in dye solution (24 and 48 hours) were examined. In the final experiment, UV-B radiation was applied to examine the uniformity and increasing the color of the flowers. I the second part of experiments, the effect of flower tonality on Vase life including water loss, flower weight loss, vase life and measuring Ethylene was examined by Gaseous Chromatography(GC). The results showed that, Brilliant blue in concentration range of 3200-6400 with pH 5.5 to 7 and 25 ? C were suitable for tonality of chrysanthemum and carnation. Cutting end of the stem based on diagonal and flat cut of end of stem and longitudinal cutting of 10 cm of flower stem and holding two end leaf and scratching the skin surface of stem improved tonality of both species. The effect of flower tonality treatment on vase life showed that in chrysanthemum, flower tonality did not negativly affect vase life, but in carnation, tonality in pH5.5 of dye reduced vase life compared to the controls. Keywords : Chrysanthemum, Carnation, Dye, Stem cut, Leaf, Temperature, Light and darkness, Postharvest life, Gas Chromatography, Ethylene