To meet the requirements of some injection simulation platforms for reality, a real adaptive topography optimization algorithm based on Real Time Optimally Adapting Mesh(ROAM) algorithm was proposed. By taking the terrain generated by ROAM as a base grid, a new integrated parameter Y was proposed, and a given threshold was compared with the Y parameter to determine whether the local splitting was implemented or not. The sharp features of the terrain were extracted from a vertex that satisfy the splitting conditions, and the local curve surface was splitted by Loop algorithm. Finally, a video stream was generated by rotation mapping algorithm in real-time roaming process and it was sent to the injection simulation system to be displayed by a Digital Visual Interface(DVI) display. Experimental results show that the average of roaming frame rate of proposed algorithm is 45.1303 frame/s and the peak frame rate is close to 50 frame/s, higher than that of traditional algorithm . Moreover, the obtained terrain could display on the DVI display on the injection simulation platform with an average of roaming frame rate of 45 frame/s, which satisfies the requirements of the injection simulation systems for the reality.