Abstract:The conventional big block damping can increase the sound transmission loss of thin plate,but goes against the light weight design.Thus a twodimensional periodically bulkdamping design is proposed in this paper.The influence of the bulkdamping parameters including distribution and shape on sound transmission loss are researched by FEM and VA one software.The results showed that the sound transmission loss was minimum with 6 damping blocks laid, at the frequency range of 16 to 125 Hz and 250 to 1 000 Hz with the increase of the number of damping blocks;while in the whole frequency band, the sound transmission loss reached the minimum when the lattice constant reached to 100 mm both in the x and y direction.So changing the lattice constant of the periodical damping structure and the damping number properly can maximize sound transmission loss in specific frequency bands. Different shapes of bulkdamping greatly influence the sound transmission loss.As for the damping shape of circle,equilateral triangle and rectangle, the circular bulkdamping possesses the best sound transmission loss.