can not show handles in the position

Your bezier handles should be showing up.  Try clicking and holding the pen tool on the top toolbar, then select the tool that looks like a slanted V - this will change your vertices from bezier to linear etc.  Use that to click and drag from one of your vertices.  Also - you will lose your ability to pull the bezier handles if you separate the dimensions of your position keyframes in the graph editor.  I can tell that you haven't done that, just letting you know - you can have bezier handles in the preview window or in the graph editor, but not both.