hello,
I know that ssh by other user to my remote machine with root access can allow user to use all resources to remote machine.
but is there any way i can prevent a ssh user to my machine with root access not to copy/write to my directory but read only files/directories. consider i am asking this as a remote user with root access who want to prevent allowed ssh connections to copy my data to his machine.

Allowing a user to log in via ssh with root permissions is equivalent to allowing a user to log in at the keyboard with root permissions. A root user can essentially do anything because they can change any permissions you set.

The only way I can think of to allow root access to your machine while still protecting the data would be to encrypt whatever data you are want to restrict access to, without saving the encryption key anywhere on the system.

A better solution would be to create a new user for the person who you want to allow access to and restrict this person's access to only the data and programs you are comfortable with them using.

Hope this helps,
Adam

Just don't allow root access via ssh. Make the user login as an ordinary user. If that user then needs root access, s/he can su to root if s/he has root's password.

Cheers.

If he/she can do that then they can read/write linetnew's home directory.

linetnew there is no way to do what you're asking - the definition of the root user is a user that can do anything. You can protect your private data using encryption as adamglauser said.