a type of B-valued martingale ergodic process that has strong meanings in physical settings is introduced and studied.When the image space has RN(Radon-Nikodym) property
by using the up-crossing inequality of Doob
it is proved that this process converges both a.e.and in Lp norm.By combining the maximal inequality of martingales and ergodic maximal inequality
the maximal inequality for this process is also obtained when the Banach space is p-smoothable.