how to unlock my apple id locked by security reasons..please tell me,how i solve my problem.

Also note "What to do after [or before] you change your Apple ID [email address] or password". Click here --> https://support.apple.com/HT204071 - "After you change your Apple ID email address or password, you might need to update your sign-in information with any Apple services you're using."

Recover your Apple ID when you can’t reset your password - "If you use two-factor authentication and can’t sign in or reset your password, you can regain access after an account recovery waiting period." - https://support.apple.com/HT204921

If you cannot resolve it yourself, try one of these contact methods:

- Contact Apple for help with Apple ID account security - https://support.apple.com/HT204169

- Click here --> https://support.apple.com/choose-country-region/ Select your country, then a product.

- Contact Apple for support and service - "See a list of Apple phone numbers around the world." - https://support.apple.com/HT201232

Read this support article, it has solutions for two frequently encountered reasons for an account to be disabled/locked. --> If your Apple ID is locked or disabled - Apple Support