本文研究了反式碘掺杂聚乙炔[CH(I_3)_y]_x在室温下正电子湮没寿命随掺杂浓度y的变化关系,发现y约在0.0025和0.043处寿命谱出现明显的突变.计算了杂质势和链间耦合积分.用链间耦合随掺杂浓度增强的概念,说明了出现上述两个突变的原因和主要元激发的转变,解释了磁化率随掺杂浓度变化的实验规律,讨论了三个区域的导电模型和电导率随温度的变化关系. In this paper, the relationship between the lifetime of positron annihilation and the doping concentration, y, of trans-iodine-doped polyacetylene [CH (I_3) _y] _x was investigated and it was found that the lifetime spectrum of y was significantly changed at 0.0025 and 0.043. The relationship between impurity potential and inter-chain coupling integral is introduced.The reason of the above two mutations and the transition of the main element excitation are explained by the concept that the coupling between the chains increases with the doping concentration, the experiment rule that the magnetic susceptibility changes with the doping concentration is explained, The conductivity models and conductivity dependence of temperature in three regions are discussed.