I Scanned and Processed with Recap to export pts file.

https://docs.microsoft.com/ko-kr/dynamics365/mixed-reality/guides/3d-content-guidelines/houdini-point-cloud [docs.microsoft.com]

and referenced this link to convert file (pts to ply)

************************
ply
format ascii 1.0
element vertex 534993 (mine is 2666226)
property float x
property float y
property float z
property uchar intensity
property uchar red
property uchar green
property uchar blue
end_header
************************

but error occurs, I think it is because of misunderstanding of file format.
I think it reads only XYZ data. and how can i allign data to read?

I am not 100% sure what you need exactly but I have done this conversion in the past. All I had to do was replace the header files. As an example, I would just paste what you have at the top of the file and replace what was there, obviously leaving all of the coordinate data.