Please try the sample code:
import os
import originpro as op
import win32com.client as win32
op.set_show(True)
## Create an Origin Graph
wks = op.new_sheet()
wks.from_file(os.path.join(op.path('e'), 'Samples', 'Graphing', 'Group.dat'))
graph = op.new_graph(template='scatter')
gl=graph[0]
plot = gl.add_plot(f'{wks.lt_range()}!(?,1:end)')
gl.rescale()
## Copy the graph as OLE object into clipboard
op.lt_exec(f'clipboard {graph.name}')
## Paste the OLE object to PPT slide
ppt_app = win32.Dispatch("PowerPoint.Application")
ppt_app.Visible = True
ppt = ppt_app.Presentations.Add()
slide = ppt.Slides.Add(1, 1)
shapes = slide.Shapes
shapes.PasteSpecial(DataType=10)
James