the reason why i need to explode the hatch is for me to upload the file in making backing sheet for other software. because if it's a hatch or block it will not including during the uploading.
If you absolutely positively have to have a solid background, use a striped hatch (such as ANSI31) at such a small scale you can't see space between the lines. Explode the hatch. You'll have thousands of lines, but you'll have your solid hatch. You may want to experiment with the scale to see how few lines you can get away with and still have it look solid--the more lines you have, the larger the file will be. I've seen exploded dot hatches that add 5MB to a drawing.
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