Abstract: At present, a large number of lecture halls in China are facing acoustic refurbishment, and the different placement of sound-absorbing materials may have significant impact on indoor sound quality. Taking the Jianzu Hall of Chongqing University as an example, the reverberation time, sound pressure level, and speech transmission index at five stages of this refurbishment project are measured and simulated, and the influences of the arrangement of soundabsorbing materials on sound field distribution and typical acoustic parameters of the hall are explored. In the lecture hall, when the same sound-absorbing material is arranged in different areas of the ceiling, the difference of declined value of the simulated reverberation time at middle frequencies is up to 13.8%. After installing the sound-absorbing material on the side wall, the maximum difference in the sound pressure level attenuation at each receiving point could reach up to 3.2 dB(A), and the speech intelligibility is notably affected by the reverberation time and early reflections. The future acoustic design of lecture halls should optimize the positions of the sound-absorbing materials and reasonably control the unevenness of the sound field.