I copied a graph into word file, but there is the margin with the graph which makes the graph occupy a lot of space. I'm wondering how to take off these margins?
In Origin, use the menu command Tools->Options. In the dialog that comes up, go to the Page tab. You can then change the Margin Control drop-down. It is probably set at Page which gets the entire page with the white space around the graph layers. Try changing to Border to Tight, which would then get only the area of the page that contains things, leaving out white space. Is this what you wanted?