在球形相对论平均场模型下,采用NLSH相互作用全面研究了从Sn质子滴线核到Sn中子滴线核的自旋对称性和赝自旋对称性．发现：1)随着核子数的增大,中子和质子的赝自旋波函数劈裂基本上都是减小的,并且质子的变化趋势更加明显．中子高能级的自旋波函数劈裂随着核子数的增大也是减小的．2)对于特定的同位素,当(?)=1时,赝自旋波函数劈裂随着(?)的增大而增大．当n=2时,中子的自旋波函数劈裂随着l的增大而增大．当l=2或l=3时,中子的自旋波函数劈裂随着n的增大而增大．3)中子和质子的赝自旋劈裂之间的差别总是比自旋劈裂的差别更大一些． In the spherical relativistic mean-field model, the spin symmetry and pseudospin symmetry of the dripping nuclei from Sn protons to Sn neutrons are thoroughly studied by NLSH interaction. It is found that: 1) With the increase of the number of nucleons, the splitting of the pseudo-spin-wave functions of neutrons and protons is basically reduced, and the trend of protons is more obvious. The neutron high-order spin wave function splitting also decreases as the number of nuclei increases. 2) For certain isotopes, when (?) = 1, the splitting of the pseudo-spin-wave function increases with the increase of (?). When n = 2, the neutron spin wave function splitting increases with increasing l. When l = 2 or l = 3, the spin-wave splitting of neutrons increases with the increase of n. 3) The difference between neutron and proton pseudo-spin splitting is always greater than spin splitting.