By analyzing numerically the disks around a young stellar object (YSO) and a black hole, we can obtain:(1) The dissipation can not be neglected as the magnetic field is in small threshold value.

• 通过分析年轻恒星周围和黑洞周围吸积盘的数值解可以得到:(1)在磁场比较小的一段阈值内；这种耗散过程是不可忽略的.