Preparation conditions of semi-coke via pyrolysis of Xinjiang Zhundong coal with different sizes were studied in an integrated fluidization bed consisting of a fluidization bed section at the bottom and a transport bed section at the top. The effects of pyrolysis temperature, excessive oxygen ratio (ER), gasification temperature and residence time on product distributions and char properties were investigated. The yield of pyrolysis gas increased with ER, gasification temperature and residence time, while the yields of char and tar decreased. The specific surface area of the char increased with the gasification temperature, while it first increased and then decreased with ER. When coal was fed into the fluidization bed, the semi-coke with the fixed carbon content over 83%(w) and volatile matter below 9%(w) was obtained under the operating conditions of ER of 0.11, gasification temperatures of 850℃ in the fluidization bed, pyrolysis temperature of 750℃ in the transport bed, and coal particle residence time of 90 s in the fluidization bed.