How to make two different Terrains in two scene?

Hi there I have two scene in my game, each of them have a Terrain. I imported a Heightmap(.RAW) for one Terrain, and find out the Terrain in the other scene changed too. Then when I modify one of the Terrains, the other changed with it. How can I make the two Terrains different in the two scene?

The terrains are probably referring to the same TerrainData object (usually called "NewTerrain" and placed in your assets folder).

Clock the "Create New Terrain" (up in the menu bar on mac) to create a new terrain which is connected to another TerrainData object.