Abstract: Inverse P-sets is a set pair which is composed of internal inverse P-set F (internal inverse packet set F) and outer inverse P-set (outer inverse packet set ),denoted by ()．It is gotten by introducing dynamic characteristics into finite general set X,which has the opposite characteristic to P-sets(packet sets)．Based on inverse P-sets,the paper presented the concepts of inverse P-information and its embedding-camouflage,discussed camouflage-restoring attribute characteristic about inverse P-information,obtained the embedding-camouflage theorems．And the theoretical results were applied to separate and discover embedded and camouflaged inverse P-information by using inverse P-reasoning.

Key words: Inverse P-sets,Inverse P-information,Inverse P-reasoning,Separation-discovery,Applications