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Abstract: This paper will examine the method of ijtihad Hasbi Ash-Shiddieqy in giving birth to Islamic legal thought products. Ijma ', qiyas, Istihsan, maslahah al-mursalah, and' urf is a method or means in producing law as a product of Islamic legal thought. The five principles that enable Islamic law to develop in keeping with the times, namely; first; principle of ijma '. Second, the principle of qiyas. Third; maslahah al-mursalah. Fourth; maintenance 'urf. Fifth; changing law with changing times.