| 序号 | 属性名称 | 中文解释 | 数据类型 | 必填 |
| GfcRoot | ||||
| GfcGeometry | ||||
| GfcSurface | ||||
| GfcNurbsSurface | ||||
| 1 | DegreeU | U向阶数 | GfcInteger | √ |
| 2 | DegreeV | V向阶数 | GfcInteger | √ |
| 3 | CtrlPtCountU | U向控制点个数 | GfcInteger | √ |
| 4 | CtrlPtCountV | V向控制点个数 | GfcInteger | √ |
| 5 | CtrlPts | 控制点矩阵，U行*V列，行优先 | LIST [0:?] OF GfcNurbsCtrlPt3d | |
| 6 | KnotsU | U向结点矢量 | LIST [0:?] OF GfcDouble | |
| 7 | KnotsV | V向结点矢量 | LIST [0:?] OF GfcDouble | |