This study was carried out to determine the effect of supplementary mineral amino acid chelate (ZnAA - MnAA) on the performance, egg quality and some blood parameters of late laying period layer hens. A total of 320, 64 wk of age Lohmann LSL laying hens, were divided into 4 groups with four replicates with 20 hen within each group. The control group was fed with basal diet and treatment groups were fed basal diet containing 1, 2 and 4 g/kg mineral amino acid chelate (ZnAA - MnAA) for 12 weeks. At the end of the experiment, there were no statistically difference among the groups in live weight, feed intake, feed conversion ratio, damaged egg ratio, mortality (P>0.05). Egg weight (P<0.01), albumen weight (P<0.01), shell weight (P<0.05), yolk index (P<0.01), yolk ratio (P<0.01), albumen ratio (P<0.01), and shell ratio (P<0.05) were found significant. The dietary supplementation of amino acid chelate (ZnAA - MnAA) were not significantly affected serum total protein, glucose, total cholesterol, Calcium (Ca), Phosphorus (P), Zinc (Zn) (P>0.05). The only statistical difference was found on the plumage score of the back region of hens (P<0.05). Also plumage coloring difference was statistically significant among groups (P<0.01). In conclusion, the supplementation of 1 g/kg mineral amino acid chelate (ZnAA-Mn AA) increased egg weight and had favourable effects on interior and exterior egg quality of laying hens in the late laying period.