The objectives of this paper are representing a simulator for the logic gates using P systems with priorities
rules, and making use of the P system parallel computing in order to reduce the time used to test or evaluate a logic circuit (set of logic gates), which may change the vision of the current logic gates systems. Also, introducing the basic logic gates and how they work together, the development of the appropriate P system models for these gates are represented, and putting all together in order to get logic circuits which are P system based, finally a simulation and a test for them using a P Lingua language simulator, and an example is introduced to illustrate and making test of the model.