This　paper　presents　a　3D　interaction　model,　which　is　an　experimental　system　for　studying　the　relation　between　control　and　parameters　in　3D　human-computer　interaction.　It　supports　3D　solid　modeling　from　3DS(3-Dimension　Studio)　file　in　OpenGL.　This　system　not　only　provides　two　different　control　modes　for　controlling　the　objects,　but　also　provides　two　experiments　to　measure　relative　parameters　in　the　interaction　control:　Optimal　Increment　Angle　and　Control-motion　Rate.　Furthermore,　this　contribution　supplies　the　results　of　the　experiments　and　gives　an　example　to　show　the　application　of　these　parameters　and　their　results.　This　research　provides　an　optimal　parameters　setting　for　the　design　of　3D　human-computer　interaction　system.