I have got the same problem as you with zooming swf files.
Tian, Here is a post referencing the bug and a workaround:http://forums.arcgis.com/threads/16704-PictureMarkerSymbol-with-SWF-not-visible-until-Map-zoomed?p=52409&viewfull=1#post52409Don't forget to click the Mark as answer check and to click the top arrow (promote) as shown below:
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