This　paper　demonstrates　three-dimensional　modeling　method　of　virtual　reality,　and　presents　a　3D　interactive　virtual　scene　design　based　on　the　Unity　3D　technology,　combined　with　AutoCAD,　MultiGen　Creator　and　Unity　3D　software　platform.　In　this　process,　the　scene　and　different　format　file　has　been　optimized,　the　network　interactive　viewing　of　virtual　scene　is　realized　too.　It　focuses　on　an　example　designed　to　obtain　a　better　real-time,　interactive　and　good　visual　effects.