Abstract: The objective is to study the effects of calcium fertilizer application on the developmental dynamics and plumpness of peanut pod under salt stress.‘Huayu 25’was used as material. Under 0.3%NaCl stress, the pot experiment was conducted with four calcium fertilizer levels: T1 (0 kg/hm2), T2 (75 kg/hm2), T3 (150 kg/hm2) and T4 (225 kg/hm2) CaO. The results showed that the dry weight accumulation of pod and volume expansion process presented a“slow- rapid- slow”trend. And the cumulative dynamics was simulated by a Logistic equation. Under salt stress, the date of maximum growth rate (Tm) of dry weight accumulation and volume of pod and kernel arrived 4-5 d and 2-5 d ahead of CK, and the maximum growth rate (Vm) was significantly lower than CK, respectively. The exogenous calcium application obviously alleviated the inhibition of peanut pods enlargement and enrichment under salt stress, and the effect of T3 was the most significant, of which the maximum growth rate of dry weight accumulation and volume increasing of pod and kernel were significantly higher than that of T1, while the date of maximum growth rate was significantly later than T1, the pod plumpness was increased, and so did the yield of peanut. According to the developmental dynamics, plumpness of peanut pods and yield, the suggested calcium fertilizer amount is 150 kg/hm2 CaO under 0.3% salt stress.