Abstract: The field test have studied the accumulation of dry matter for black peanut sowed in summer and characteristics of absorption of N, P, and K, which show that the total plant dry weight mounted up at the duration of plant’s growth, and the most fasted growth period was appeared at the late of August. The total process was divided into the slow rise period, the fast rise period and the stabilization period, and the important turning points was appeared at the mid-July and the late of August respectively. The plant demand little N, P, K at the earlier period, after the plant emerging, the total absorbed nutrient (TAN) was insufficient of 1/3 at the first of 70 days, then raised greatly until the harvest time, and the TAN was almost the 2/3 at the late of 40 days. To produce 100Kg pods the plant need assimilate N5.65Kg,P2O50.83Kg,K2O3.84Kg,N: P2O5: K2O =1:0.147:0.648.