how to convert grid data to excel sheet ..any smart service there please help me

Hi if you are using Appian latest version, I would suggest you to create a record for that entity or view. Then use that record data to configure your grid. Since export to excel is out of the box functionality for records you can export data directly form grid it self just enabling export functionality.

For more information how to configure record grid https://docs.appian.com/suite/help/22.1/read-only-grid-configuration.html