P-sets (packet sets) is a set pair which constitutes with internal P-sets and the outer P-sets. To describe the evolution of concept and form contexts, the basic ideas of P-sets theory are organi-cally introduced into the construction of concept lattice, i.e. P-concept lattices in this paper. Ini-tially, the construction ideas and methods of P-concept lattices and its basic properties were dis-cussed. Furthermore, the transformed theorem between P-concept lattice and classic concept lat-tice were proved. Finally, the construction algorithm was applied in a case study, which proved the rationality and feasibility. P-sets; Concept lattice; Evolution; Formal Context
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