By equations of radiative trasfer in Eddington approximation,local energy conservation and hydrostatic established,the temperature distribution in vertical direction is studied. It is found that a corona forms above disc.

• 通过建立吸积盘Eddington近似下的辐射转移方程,局域能量守恒方程以及流体静力学平衡方程,对轴向求解温度分布,发现由于大气中粘滞能量耗散,吸积盘上有冕形成。