I use the web video to edit in MC,so there are no so much useful timecode.I found that timecode between MC and resolve mismatches,the current timecode of clip in resolvle is more 24 hours than MC.How i can remap two timecode correctly?

the clip in MC

the clip in resolve

When Resolve displays 24:00:13:08 it's actually the same as 00:00:13:08. If you want to change the timecode in Resolve, go into the Deliver page. At the bottom left of the display you will see the timecode. It will likey say it's 24:00:13:08. Right-click on the timecode and choose Source timecode and then export. Import that clip into Media Composer and see if the timecodes match up.

oops,i didn't explain clearly,i edit in MC and i can't conform in resolve because the timecode mismatch just like topic,the clips still offline so i can't export the clips to MC.But I still do what you said that changed timecode of the bottom left of the display to source timecode and it's still 24:00:13:08

I found the method in the forums,someone used the software which is "shutter encoder" to give those clips with new timecode,they just change the timecode not to recode, then you can put them in MC to edit,send AAF to resolve for conform,and they do a good job.

Law5:

"shutter encoder" to give those clips with new timecode

As I remember, it's under the the 'Rewrap' function.

For those unfamiliar with this software, Shutter Encoder is a very useful (free) utility which is like Handbrake, but with many more features. For instance, it allows transcoding into ProRes on PCs.

What kind of footage are you using?

I have seen this mostly, (if not exclusively) when dealing with Canon footage. 

My solution was to assign proper timecode to the product before editing.  (I know it doesn't help if youve already begun)

Typically I would use one of video toolsheds tools to assign new timecode, but i'm sure any rewrap progPostram would work fine.