hello i want to know how to make a character move left and right usiing tilt method
This will tell you how:
You can access the tilt feature by using Input.acceleration. See here in the Unity3D Documentation.
An example function to make movements up and down would be.
Vector3 movement = new Vector3 (Input.acceleration.x, 0.0f, 0.0f);
rigidbody.velocity = movement * speed;
The documentation asumes that your device is held parallel to the ground and is in the right hand so you might also have a look at Input.deviceOrientation (see here)