procedure LoadGIFImage(img: TImage);
var
  aGIFImage: TGIFImage;
begin
  aGIFImage:=TGIFImage.Create;
  aGIFImage.LoadFromFile('C:\test.gif');
  aGIFImage.Animate := True; //主要是多了这句来激活，否则就是一张静止图
  img.Picture.Assign(aGIFImage);
  aGIFImage.Free;
end;

  
procedure LoadGIFImage(img: TImage);
begin
  img.Picture.LoadFromFile('C:\test.gif');
  if img.Picture.Graphic is TGIFImage then
    TGIFImage(img.Picture.Graphic).Animate := True;
end;