Abstract: The existence of slits has restricted the improvement of sound insulation performance of the conventional partition wall structure. The sound transmission loss of partition wall under the existence of slits is studied. The effects of the staggered slit depth and the staggered slit distance on the sound transmission loss of partition wall are analyzed. The experimental results show that the sound insulation performance of the plasterboard whole component with the staggered slits is better than that with the straight slits. The effect of the staggered slit depth depends on the variations of the surface density of partition wall structure and the sound wave propagation path. When the staggered slit distance is close to the partition wall thickness, the sound insulation performance of the partition wall reaches the best. The reason might be explained is that the transmission degree of sound energy through the wall is quite equal to that through the staggered slits, which makes up for the "short board" of sound transmission in the partition wall structure with slits.