The Khalidi branch of the Naqshbandi order is an applied tradition of Sufism based on the unity of science, fiqh, Sufism and Shariah. The education of fiqh and fiqh procedure (usūl alfiqh) and unity of fiqh and Sufism in the tradition of Sufism in general come into prominence in the Khalidi Naqshbandi tradition more specifically. One of the contemporary representatives of this tradition is Muhammad Amin al-Haydari who lived between 1927 and 2003, and Haydari madrasah. Muhammad Amin al-Haydari and Haydari madrasah are related to the Khalidi branch of the Naqshbandi order through Sheikh Ahmad al-Haznevi’s circle. The education of fiqh and fiqh procedure (usūl alfiqh) has a highly significant place in this madrasah that continues its guiding activities based on science and Sufism under the guidance of Ahmad al-Haydari. This study discusses fiqh, fiqh procedure (usūl alfiqh), Sufism and the relationship between Sufism and fiqh in general, and examines them as part of the Khalidi Naqshbandi tradition and in the case of Haydari madrasah, one of the contemporary representatives of this tradition.