用ＩＮＤＯ系列方法对Ｃ进行几何构型优化，得到Ｄ_（３ｄ）对称性的构型，表明Ｃ　确实发生了Ｊａｈｎ－Ｔｅｌｌｅｒ畸变，导致单键变短，双键变长，形成１０种键，６种不等同碳原子，并以此构型为基础，计算了Ｃ　的电子光谱，与实验结果吻合；同时对光谱进行了理论指认；最后对Ｃ　的３种构型：Ｄ（５ｄ），Ｄ（３ｄ），Ｄ（２ｈ）的几何构型、能量、光谱和反应特性进行了分析、比较和总结。 The geometrical configuration of C was optimized by INDO series method, and the D_ (3d) symmetry configuration was obtained, indicating that Jahn-Teller distortion did indeed occur in C, resulting in the shortening of the single bond and the prolongation of the double bond, forming 10 kinds of bonds, 6 Based on this configuration, the electronic spectra of C were calculated and the results were in good agreement with the experimental results. At the same time, the spectra were theoretically identified. Finally, the three configurations of C (D (5d), D 3d), D (2h) geometry, energy, spectra and reaction characteristics were analyzed, compared and summarized.