Abstract: Task scheduling and resource scheduling are two major aspects concerned with Abstract: Boolean expression simplification has been applied widely in research areas and industries. In the research fields of traditional Artificial Intelligence and Symbolic Intelligence, Symbolic Computation and Inference play an important role. Boolean expression and Boolean logic simplify the circuits design in digital electronics. Boolean expression also applies to simplify the knowledge in data mining. This paper applies the characters of primes in the mathematical theory of numbers, transfers the symbolic computation into value computation, and designs a tool of Boolean expression simplification. Based on the characters of primes, authors redefine AND, OR, and NOT for the Boolean functions, provide the corresponding inference rules, and propose the simplification algorithm of Boolean function. The tool for the simplification of Boolean expression has been implemented. The computation module for the big database has been created for the tool to make sure there is no limitation to the number of variables. The tool could be used independently. Also it could provide DLL to the other software, tools, and algorithms. The tool has been used in the predication of churn of the customers in Telecommunication industry and obtains perfect results.