In this paper, a simplified definition of boundedness of the sets in probab
ilistic normed linear space was introduced. By means of the probabilistic n
orm of linear operators, the linear operator theory on probabilistic normed
linear space was further studied. On probabilistic normed linear operator
space, some resonance theorems dealing with probabilistic bounded sets, pro
babilistic semi-bounded sets, and probabilistic non-unbounded sets are obta
ined.