In order to provide a theoretical basis to further understand characteristics of ‘Ningdu Yellow’Chicken germplasm and comprehensively assess the effect of ‘Ningdu Yellow’ Chicken hybrids,egg weight from the open production to 210 day-old was measured,and the impact of the hybridization,age of first egg and open production weight on egg weight was statistical analyzed.The results showed that although hybridization chicken had very little blood of exotic species Isa,but its egg weight would still increased.The effect of open production age on egg weight was very large,and this effect would last for a longtime.Chickens opened production too early whose eggs would be small inalong term.