How can I know the robots actual position ?

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please Elaborate and describe your System Setup. Real Robot? Simulation? Which nodes? What is your Goal?

it is a mobile robot in simulation environment, it uses 2 laser sensors for localization. My gaol is to know the actual position of the robot on the map. I try to listen /amcl_pose from inside move_base node,but it did not work. Is there any library to do that or /amcl_pose is the only way ?

What do you mean with did not work? Any why don't you just use the tf from /map to base_link?

I will try tf from /map to base_link, thanks