Hi v varaprasad,
Use the Import Article Translations feature in Setup. You can only import articles that have been exported from the same Salesforce organization.
For example, you can't export articles from your test or sandbox organization and import them into your production organization.

USER PERMISSIONS NEEDED
To export articles:    
Manage Salesforce Knowledge AND Manage Articles AND Manage Knowledge Article Import/Export
To view articles:    Read on the article type
To create articles:    Read and Create on the article type

1.From Setup, enter Import Article Translations in the Quick Find box, then select Import Article Translations.
2.Choose how Salesforce handles translations after they're imported.
OPTION    DESCRIPTION
Review imported translations on the Article Management tab before publishing    Add imported translations to a queue from which agents can review them.
Publish translations immediately on import    Publish imported translations without reviews.
3.Select the language of the articles you're importing.
4.If you chose to have articles reviewed before publishing, select to send the files to a user or a queue.
5. Click Browse, choose the translation .zip file to upload and click Open.
You must place all the translation files (meaning, those exported from Salesforce and translated by your vendor) in a folder whose name is the same as the language code. For example, put French articles in an fr folder. Zip up this folder to create your import file.
6.Click Import Now.
If you have more translated articles to upload, repeat steps four through six.
7. Click Finish.
An email notification is sent to you when your import finishes. 
You can view the status of your import from Setup by entering Article Imports and Exports in the Quick Find box, then selecting Article Imports and Exports.

I hope you find the above solution helpful. If it does, please mark as Best Answer to help others too.

Thanks and Regards,
Deepali Kulshrestha