Please tell me how to make a ramp like this.

[LeeJaeYoung]

I can't make the connection part accurately. ^^

The problem is that it is difficult to process the green line part.

[Tim Ball]

A beam with complex profile at correct inclination might work

[LeeJaeYoung]

Is it possible for me not to do this?

[scottjm]

I would use a mesh. 

[LeeJaeYoung]

Is the answer to make it a mesh or a morph?

Custom Ramp Modelling - YouTube

However, there are concerns about whether the thickness of the slab can be accurately determined.

[DGSketcher]

Try making it with roofs and use Intersect Single-plane Roofs.

If that doesn't solve it then you will need to place a flat transition where the roofs meet to turn the corner. That is the only way to eliminate the twist where the beams are meeting in your picture.

[LeeJaeYoung]

Thank you for answer.
It seems a little off. ^^

[thesleepofreason]

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[Eduardo Rolon]

Yes, either.

Another option is to use 2 Slabs.

Convert to Morph

select the vertical planes

move them up (or down) in 3D Window

But I think that per IBC Code that corner needs to be flat and ADA compatible so all these suggestions are moot.

[DGSketcher]

You should also note that in @Eduardo Rolon image, there is a new line in the ramp (red). This tells you that the 4 points forming the slab are no longer on a single plane and the top face needs to be formed by two triangles. This could be a problem for your finishes.