建立了质子自旋依赖的结构函数的第一矩与ＧＤＨ求和规则之间的关系．根据这个求和规则和重子结构的［ＳＵｓｆ（６）Ｏ（３）］ＳＵｃ（３）夸克模型，讨论了质子的自旋问题，并把理论的结果与ＥＭＣ和ＳＬＡＣ的实验作了比较，结果相一致．发现在低动量转移区，Ｐ３３（１２３２）的光激发的贡献是最重要的，而且是负的．在高动量转移区，Ｐ３３的贡献是正的，而且随Ｑ２的增加很快减小，可以略去，从负值到正值的转折点是在Ｑ２＝０．３２ＧｅＶ２附近 The relationship between the first moment of the proton spin-dependent structure function and the GDH summation rule is established. Based on this summation rule and the [SUsf (6) O (3)] SUc (3) quark model of baryon structure, the proton spin problem is discussed and the theoretical results are compared with those of EMC and SLAC , The result is consistent. The contribution of photoexcitation of P33 (1232) was found to be the most important and negative in the low momentum transfer zone. In the high momentum transfer zone, the contribution of P33 is positive and decreases rapidly with increasing Q2, which can be omitted. The turning point from negative to positive is around Q2 = 0.32GeV2