Kalabad madrasa among the Madrasahs of the 3rd level. Madrasahs of this category were taught by teachers of different backgrounds. 2 teachers taught in the Kalabad madrasa 200 students were educated. According to several historical documents, mudarris were paid 45-60 gold each. In a historical source, the names of several such mudarris are Mullah Rahmatullah and Mullah Said. None of the persons related to the activities of the madrasa should leave the madrasa for two months without a valid reason. A. K. Jumanazar assumes that scholars of the Middle Ages, such as Imam al-Bukhari, Abu Hafs al-Kabir, Abu Hafs al-Saghir, Ishaq al-Kalabadi, Abu Ali ibn Sina, studied in the Kalabad madrasa. Later, on the official website of the Imam Bukhari International Scientific Research Center under the Cabinet of Ministers of the Republic of Uzbekistan, it is noted that Imam al-Bukhari and many other famous historical figures were educated in the Kalabad madrasa. In the book published by the International Islamic Academy of Uzbekistan, it is said that Imam al-Bukhari started his first Madrasah education at this school. Architecture Kalabad Madrasah was one of the largest Madrasahs in Bukhara in terms of size and scope. It is made of baked brick in the traditional style of Turanian Madrasah construction, with a square layout, 2 floors, and 2 porches. The front facade of the Madrasah consists of the main entrance and two wings. The peshtok is installed from the north to the south of the longitudinal axis. Information about the remnants of tiled coverings has been preserved on the facade. The wings included 2-story rooms. Madrasah is entered through the front gate. Behind the gate is a miyansarai, through which the corridors leading to the madrasa courtyard pass, and on both sides of it there are madrasa halls (mosque and classroom). The courtyard behind Peshtok is surrounded by many cells. It is said that his classroom was large and had 100 rooms for students. Based on the information found by O. A. Sukhareva, researchers report that the number of madrasa cells was 100 or about 100. According to other sources, their number reached 79. The peculiarity of Madrasah architecture is that there are no flower bouquets installed on the corners of the walls on both sides of the main facade; there was a special porch under the roof arches, equal to the 2nd floor. Later, this style was used in Khorezm madrasahs;