# SPLINE Command
[GstarCAD 2027](Help%20System/GSTARCAD/2027/Index.md) → [Commands](Help%20System/GSTARCAD/2027/Commands/(Commands).md) → [S](Help%20System/GSTARCAD/2027/Commands/S/(S).md)
## Function Description:
This command is used to create smooth curves through or near a group of fit points.
The SPLINE is called non-uniform rational B-spline (NURBS), for simplicity, called splines.It is defined by fit points. By default, the fit points are coinciding with spline.
## Command Access:
> **Icon:** 
> **Menu:** Draw > Spline
> **Ribbon:** Home > Draw > Spline
> **Toolbar:** Draw > Spline
> **Command:** SPLINE
> **Alias:** SPL
## Command Prompts:
```
Specify first point or [Object]:
Specify next point:
Specify next point or [Close/Fit tolerance] <start tangent>:
```
## **First point**
Specifies the first point of a spline.
## **Object**
Converts 2D or 3D polylines that fitted by quadric splines or cubic splines to equivalent splines. Users can save or discard the original polyline by setting the DELOBJ system variable.
## **Next point**
Prompts to create other splines, pressing Enter to end the command prompts.
## **Close**
Closes the spline by defining the last point coincides with the first point. By default, the closed spline is periodic and keeps curvature continuously along the entire ring.
## **Fit tolerance**
Specifies the offset of fit points of a spline. If the fit tolerance is 0, the created spline passes through all fit points. The fit tolerance is applied on all fit points (except the start point and the endpoint).
## **Start tangent**
Specifies the tangent condition at the starting point of a spline.
## **End tangent**
Specifies the tangent condition at the ending point of a spline.
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**Related References：**
- [Commands about Creating Procedural Surfaces (GstarCAD 2026)](../../../2026/Commands/00%20Command%20Groups/Commands%20about%20Creating%20Procedural%20Surfaces.md)
- [Commands about Curved Objects (GstarCAD 2026)](../../../2026/Commands/00%20Command%20Groups/Commands%20about%20Curved%20Objects.md)
**Related Tasks：**
- [To Work With Circles (GstarCAD 2026)](../../../2026/Commands/01%20Procedures/To%20Work%20With%20Circles.md)
- [To Work With Ellipses (GstarCAD 2026)](../../../2026/Commands/01%20Procedures/To%20Work%20With%20Ellipses.md)
- [To Work With Arcs (GstarCAD 2026)](../../../2026/Commands/01%20Procedures/To%20Work%20With%20Arcs.md)
- [To Draw a Helix (GstarCAD 2026)](../../../2026/Commands/01%20Procedures/To%20Draw%20a%20Helix.md)
- [To Work With Splines (GstarCAD 2026)](../../../2026/Commands/01%20Procedures/To%20Work%20With%20Splines.md)
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[Original help](https://www.gstarcad.net/help/GstarCAD_2027_en-US/detail/commandReferences_S/SPLINE.html) · © Gstarsoft Co., Ltd.