Oh, I get my wallet back!
Here's my method:
1. modify my backup manually. delect all counts which is sth like ' "type": "account_record_type",'
2. import the backup again then it will show sth like GENESIS -> BTSXBiLTEu8f8.....
3. goback to backup again and search for 'BTSXBiLTEu8f8...' then you will find sth like
"account_address": "BTSXBiLTEu8f8Wfu...",
"public_key": "BTSX8LQcFJCa...N",
"encrypted_private_key": "9477348519fcb...."
4. go to console -> wallet_dump_private_key BTSX8LQcFJCa...N
then you will get your prive_key and apply for a new account and import the private_key and rescan.