Abstract: 【Objective】This study was conducted to determine the effects of a small amount of eggshell powder instead of stone powder on laying performance, egg quality and calcium metabolism of laying ducks.【Method】Eighty healthy 180-day-old ducks were randomly divided into two groups（control group and test group）. There were 5 replicates in each group and 8 duck eggs in each replicate. The control group was fed with normal basal diet, and the test group was fed with basal diet among which 2 g calcium was replaced by the same amount of eggshell powder. The test period lasted for 56 days. The laying performance, egg quality, calcium deposition, calcium and phosphorus contents in blood and levels of calcium metabolism-related hormones were measured during the experiment.【Result】The average egg weight, eggshell strength and protein height of the test group were significantly higher than those of the control group, which showed that adding eggshell powder could obviously improve egg quality. The levels of calcium deposition, serum phosphorus and plasma parathyroid hormone（PTH）in the test group were significantly higher than those in the control group. The blood calcium content of the test group 4.74（±1.17）μmol/mL was extremely significant higher than that of the control group 2.79（±1.00） μmol/mL, showing that eggshell powder was not only more conducive to calcium deposition, but also significantly increasing the contents of calcium and phosphorus as well as the levels of parathyroid hormone in blood.【Conclusion】The results indicate that a small amount of eggshell powder replacement can significantly promote calcium metabolism and calcium deposition, increase the average egg weight and improve the egg quality.