Broblem for wallet blockchain privet key When I want to convert btc from my wallet blockchain, they ask me to enter my private-key. When I enter it, I am asked to enter the password for the private-key. I do not know the password for private-key.

Is there a solution?
Without more information, I see a few posibilities:


You may have a BIP38 encrypted private key.  


see: https://github.com/bitcoin/bips/blob/master/bip-0038.mediawiki

I suspect that maybe you are trying to claim a paper wallet?  If so, you need to know the password, or brute force it (unlikely).


If you are referring to a blockchain.com (formerly blockchain.info) wallet, those are proprietary to them and use their own format for the keys.  Again, you need to know the password, or brute force it.


If you don't have the password to your key any longer, then there are some wallet recovery services on the internet, which are risky and take a large percentage of the balance.  You can google "bitcoin wallet recovery", and always check reviews before engaging with one of these services to check their reputation.  Even so, they may be unable to recover the password.

Barring that desperation, do not provide your private key to anyone!