Hi I'm new to this site.If I used a emulator on a website ,will my submission be rejected?

It would probably be rejected. Which site?

I recommend getting an emulator - nestopia or mesenrta are current favorites!

GLHF and welcome :D

@narfman0 Thanks.I've just downloaded nestopia,and it works a lot better than the emulator on the site.By the way,I feel happy for your new WR =D

PS:I'll send most of my submission video to bilibili.com