Abstract: ObjectiveThe present experiment was conducted to study effects of polyamine and its synthetic inhibitor methylglyoxal bis-guanylhydrazone(MGBG) on physiological indexes of Armeniaca vulgaris Lam. Jintaiyang seedlings un-der drought stress, in order to provide reference basis for anti-drought cultivation. MethodOne-year grafted seedlings of A. vulgaris Lam. Jintaiyang were taken as experimental materials. Six treatments including treatment 1(CK),treatment 2(D.), treatment 3CK+spermine(Spd),treatment 4(D.+Spd),treatment 5(D.+MGBG) and treatment 6(D.+MGBG+Spd) were applied. The seedlings were sprayed one time every two days. Contents of malondialdehyde(MDA),soluble sugar and pro-line(Pro) and chlorophyll, photosynthetic parameters in leaves of A. vulgaris Lam. Jintaiyang seedlings were measured af-ter being treated for 30 days. ResultUnder drought stress, contents of MDA,soluble sugar and Pro in A. vulgaris Lam. Jintaiyang seedling leaves increased, and total content of chlorophyll and photosynthetic parameters decreased. Spd (1.0 mmol/L) treatment improved contents of MDA,soluble sugar and Pro, total content of chlorophyll and most photosynthetic parameters in A. vulgaris Lam. Jintaiyang seedling leaves. Spd(1.0 mmol/L) treatment under drought stress increased sig-nificantly contents of MDA, soluble sugar and Pro, total content of chlorophyll and most photosynthetic parameters in A. vulgaris Lam. Jintaiyang seedling leaves(P<0.05). MGBG(1.0 mmol/L) treatment under drought stress decreased contents of MDA,soluble sugar and proline,total content of chlorophyll and most photosynthetic parameters in A. vulgaris Lam. Jin-taiyang seedling leaves. ConclusionSpd(1.0 mmol/L) treatment can improve A. vulgaris Lam. Jintaiyang seedlings adap-tation capacity to drought stress, which can be applied in large-scale cultivation.