With the development of fabricate technology for digital signal processor(DSP), the power dissipation of the bus is the main part of the whole power dissipation in DSP. This paper researches the power saving ways for address bus、data bus、internal bus in LS-DSP . Bus coding technology has been used for that purpose. The experimental results show that the LS-DSP bus power can reduce effectively when it uses the power saving ways discussed in this paper are used.