After the Arab invasion Central Asia became part of wide Islamic world. This gave a new impulse to international trade through the territory of Boysun. Alongside the trade routes caravanserais had been set up. Traces of one of them have been preserved on Ak-tepa at Shurob kishlak. The South road passed from here through Sairob kishlak alongside Sherabad-daria. The East road continued out to the red hills of Qizilchi, where Bozor-tepa settlement appeared. On the place of present Boysun the big fortified city of Basand appeared. In 9-10 centuries Boysun became part of Chaganian, the rulers of which were vassals of the Samanids. In the beginning of the 11th century in the surroundings of Boysun iron-ore exploration began. During the 11th century the territories of Chaganian and Termez were fought for by the Qarakhanids, Seljukids and Ghaznavids. In the XII century these land had been fought for by: the Gurids, Qarakhanids, Guzi, Qarluks, Qarachitays and Khorezmshahs. Political instability continued the epoch of Temurids, led to the emigration of Boysun inhabitants to the mountains. Dating from period of the Mongolian invasion, the artificial underground construction Buri-Kabir probably played the role of a shelter. The revival of trade routes at Temurids is witnessed by the finding of a treasure of silver coins related to that period. During the Shaibanids period the caravanserais were re-built, such as the Rabat of Abdullakhan situated or the route from Shurob kishlak to the salt-mines, the middle stream of Kofrun-sai the dam of Saryband was built and on its lower reaches, the Bridge of Iskandar. In the second half of the 18th century the Emir of Bukhara, Muhammad Rakhim, had conquered Boysun, leading to the formation of the Boysun Bekhanate.