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A qualitative nature of logic based on al-Ghazali’s teaching is reviewed. It is shown that its structure is not the same as the wellknown two-valued logic which satisfies the well-known Boolean algebra. Unfortunately, it is this classical logic that has been adopted by those who discuss or use the nature of the al-Ghazali’s logic or reasoning ever since. The more appropriate logic for the al-Ghazali’s logic is the modal logic and hence the algebraic structure of this logic is reviewed. However, it is shown that even this logic, which was originally contributed substantially by Islamic scholars, in particular Ibn Sinna, and further improved by twentieth century Western scholars, is not yet fully suitable for the al-Ghazali’s logic. A new algebraic system of logic is still very much needed for characterizing the al-Ghazali’s reasoning.

A Need for New Algebraic System of Logic Based on Al-Ghazali’s Reasoning Shaharir bin Mohamad Zain