Hey I lost all my photo how can I get back

Restore from you backup http://support.apple.com/kb/HT1766

Also you should be importing your pics to your computer http://support.apple.com/kb/HT4083

That is very vague.

What photos?

Pics taken with the iphone? Did you fail to import them to your computer?

Pics synced from your comptuer to iphone?

What happened prior to the loss?

Update?

Restore?

Hard to help when you provide no info about your issue.