Abstract: P-sets have dynamic characteristics. P-sets are a new mathematic tool in dynamic information system. The concepts of external-distortion data and external-distortion data circle were proposed by using the outer P-sets and F-supplemented sets in P-sets structures. External-distortion data is a data pair which is composed of (x)F and(x)+,or ((x)F,(x)+).External-distortion data circle is a data circle pair which is composed of OF and O+, or (OF,O+).Using the concepts, this paper discussed the generation and identification about external-distortion. The theorems of generation and identification on external-distortion data were got The criterion of identification for external-distortion was given.The application on the identification of external-distortion data was provided.

Key words: P-sets, External-distortion data, External-distortion data circle, Data generation-identification, Application