Grain-filling characteristics and changes of hormonal content in the seeds during grain-filling analyzed with ‘Zhengzhi 98N09’ under field cultivation conditions，which provided a theoretical basis for high yield and efficient cultivation and quality breeding.The results indicated that:（1）No.9～17 nodes had the highest dry matter ratio.The capsule fresh weight was maximum (1.596 g/capsule) at filling 24 d and seeds fresh weight was maximum (0.318 g/capsule) at filling 27 d of the lower node capsules(4～8 nodes).Grouting 15～33 d were the fastest grain-filling period,with 61.75% of the volume of dry grain weight were dry matter accumulation;The capsule fresh weight and seeds fresh weight were simultaneous maximum (1.622 g/capsule,0.379 g/capsule) at filling 27 d of the middle node capsules（9～20 nodes）.Grouting 21～36 d were the fastest grain-filling period,74.21% of the volume of dry grain weight were dry matter accumulation;Grouting 9～12 d and 24～27 d were the fastest grain-filling period of the upper node capsules（20 node after）.(2)GA₃ content of the middle capsules was greater than that of the lower capsules and the upper capsules,but ABA and IAA content were lower than that of the lower capsules and the upper capsules;GA₃/ABA,ZR/ABA,GA₃/IAA and ZR/IAA ratio of the middle capsules were greater than that of the lower capsules and the upper capsules,except ZR/GA₃ ratio.(3)Higher ZR content and lower ZR/ABA,GA₃/ABA,GA₃/IAA and ZR/IAA ratio were better for endosperm cell division,capsule development,development of the grain storage capacity and dry matter plumpness.(4)There were significant or highly significant negative correlation between single endogenous hormone and different parts of the single capsule seeds weight.The interaction of different endogenous had less influence on the increase of the lower capsule seeds weight.The middle and upper capsules per seeds dry weight were significantly improved for appropriate increase in the IAA/ZR,ABA/GA₃ and IAA/GA₃ ratio.