In the early stage of pod enlargement, exogenous gibberellin (GA) and abscisic acid (ABA) were applied to young pods of peanut variety 05D610 with normal seed and its seed shrivel mutant 05D677. By measuring content change of endogenous GA, ABA, ZT (zeatin) and IAA (auxin), as well as the change of growth characteristics in pods and seeds, we study the relationship between the pod or seed growth and hormones contents, and analysis the causes of seed shrinkage in 05D677. The main results were as follows: (1) endogenous GA and ZT contents of pods and seeds were significantly increased, peak time of IAA content of that delayed, the dry weight of pod increased significantly, after exogenous GA treatment in 05D677. (2) Endogenous GA and ABA contents of pods and seeds were significantly increased, peak time of IAA content of that delayed, the dry weight of seeds increased significantly, after exogenous ABA treatment in 05D677. (3) In the stage of pods expanding, inadequate contents of GA, ABA and ZT in 05D677 pods or seeds lead to seeds shrinkage.