在等离子体密度分布一定的情况下 ,从电子、离子的能量输运方程出发 ,对常规剪切和中心负剪切位形下高性能自持燃烧的氘氚等离子体进行了研究 .常规剪切下采用与能量约束改善因子H有关的Bohm热传导系数 ,中心负剪切下采用一个与磁剪切有关的Bohm gyro Bohm混合型的热传导系数 ,并考虑了α粒子反常扩散和动态反馈加热对氘氚自持燃烧的影响 .研究结果表明 ,常规剪切下当H≥ 3时 ,才有较大的能量输出 ,当H接近 4时无须动态反馈加热氘氚就能获得自持燃烧 ;在中心负剪切位形下 ,等离子体的运行性能更高 ,有更高的能量输出 ,一旦氘氚达到燃烧条件 ,无须动态反馈加热就能获得自持燃烧 ;α粒子的反常扩散对氘氚燃烧有较大影响 ,在常规剪切下 ,适当的反常扩散有利于燃烧 ,在中心负剪切情况下 ,反常扩散过大 ,氘氚将变得不能自持燃烧 ;动态反馈加热对维持常规剪切下氘氚燃烧起了重要作用 Based on the energy transport equations of electrons and ions, the deuterium-tritium plasma with high-performance self-sustaining combustion under the normal shear and center negative shear configurations was studied under the condition of certain plasma density distribution. A Bohm heat transfer coefficient related to the energy constraint improvement factor H is used. A central heat shear coefficient is used for the Bohm gyro Bohm mixed heat transfer coefficient associated with magnetic shear, and the α-particle anomalous diffusion and dynamic feedback heating are considered for the self-sustained deuterium- The results show that when H≥3, the energy output is larger when H ≥ 3, and self-sustaining combustion can be achieved without the need of dynamic feedback heating of deuterium-tritium when H is close to 4. When the center negative shear configuration , The plasma has higher operation performance and higher energy output. Once the deuterium-tritium reaches the combustion condition, self-sustaining combustion can be obtained without dynamic feedback heating. The abnormal diffusion of α particles has a greater impact on the deuterium and tritium combustion, Shear, the appropriate anomalous diffusion is conducive to combustion, in the case of negative shear center, abnormal diffusion is too large, deuterium and tritium will become unable to self-sustaining combustion; dynamic feedback heating to maintain Under Regulation shear burning deuterium and tritium play an important role