hi am trying to save sensor data via arduino atmega2560 and ethernet shield can anyone suggest mean project method..
Take a look at the examples of the Ethernet library or provide more detailed information about what you want to achieve.
Where do you want to send the data ? text file, sql database, ... ? Do you have a web server with a fixed IP address, and able to run a php file on the server ? Or are you connecting to a local PC running Xampp or similar ? If so, you can use ethernet.client to send the data to a php page, and have the php page save to data to the server.