中文摘要：

本文基于双流体模型，通过理论分析获得了芯部离子温度梯度（ITG）模和俘获电子（TE）模的色散关系。在Weiland模型的基础上，考虑了离子平行方向速度和 TE的影响，计算了碰撞对ITG模和 TE模增长率的影响。对 HL‐2A等离子体的计算结果表明，芯部等离子体的ITG模和TE模增长率与扰动波数密切相关，磁剪切对IT G模有明显的抑制作用。

英文摘要：

Based on the two‐fluid model ,the dispersion relation of ion temperature gra‐dient （ITG） mode and trapped electron （TE） mode was analyzed theoretically .Based on Weiland model ,the effect of collision on the growth rate of ITG mode and TE mode was studied with the consideration of ion parallel velocity and TE . The calculation result based on HL‐2A shows that the growth rate of ITG and TE modes in core plasma is closely related to perturbed wave number .Moreover ,the growth rate of ITG mode is proved to decrease in the presence of magnetic shear .