What should i do? my iphone4 shutdown when i update it into iOS7. the apple logo just keep on blinking even computer cannot read my iphone anymore.

plz help me how to fix this.

See Here  >  http://support.apple.com/kb/HT1808
You may need to try this More than Once...  Be sure to Follow ALL the Steps...
Take your time... Pay particular attention to Steps 3 and 4.
Some users have reported as many as 8 or 9 attempts were necessary before success.
After you have Recovered your Device...
Re-Sync your Content or Restore from the most recent Backup...
Restore from Backup  >  http://support.apple.com/kb/ht1766

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