Abstract: In this paper, simulations of coronal mass ejections between two coronal streamers are conducted based on a two-dimensional MHD equation set. In order tore-appear the general characteristics of the CME, the simulation adds the closemagnetic field caused by a cycle current and the disturbing-pressure. The resultsshow: The disturbance can lead to an obvious plasma loop structure with highdensity and a low-density region behind the outer loop. They produce both radialand transverse expansion in different degree. The results apporoximately conformto the main characteristics of No.80127 CME event.