I release android application and leave fields blank to sign APK with an auto-generated debug certificate , I have a update application problem with APK that is signed with a different certificate. How to get the same key from auto-generated key?
Sorry about my language skill 
Maybe I misunderstand you, but you should not release an app with an auto generated debug certificate. That is for local testing only.
Thank you for your reply
OnIy way to solve this I should do from this link http://www.defold.com/doc/android#_creating_certificates_and_keys
and new application on play store right?
Yes, that should work.