Heidegger believes that logic concerns the meaning of a sentence and the content of judgment. The development of mathematical logic makes logic lose its significance and depart from the ontological discussion. Philosophical logic is not a new discipline but has just realized the characterization of the traditional logic, and also a deviant logic different from mathematical logic. Through studying the relationship between logic and philosophy, we obtain a deeper understanding toward the nature of logic and the relationship between different logical systems. The formal differentiation of different logical systems helps us better clarify the philosophical concept and explain it more accurately. In studying philosophical logic and the philosophy of logic,we must keep it in mind that logic needs philosophical justification and philosophy is the basis of the study of logic. Philosophical logic is the application of logic in philosophy and the philosophical idea has been inculcated deeply in this process of application.