Hi guys, finally I worked this out. Actually, Obsidian file link mechanism just follows the rules of markdown file standard, you can refer to this Q&A in stackoverflow: hyperlink - How link to any local file with markdown syntax? - Stack Overflow, and also I tried ways they discussed, finally I found a good one to achieve my goal, it is pretty simple, just make it like this:
[YourDocument](<…/…/Doc/YourDoc.pdf>) . This works in obsidian and also if you hover your mouse on it there is also a preview effect.
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