In the deep sub-micron technology domain

the energy consumption of data bus accounts for the energy consumption proportion of embedded multi-core chip is increasing.FV-MSB method was used to reduce the off-chip data bus energy consumption.However

it didn't deal with the non-frequent values and the lower parts of the frequent high-ordered bits values.In order to further reduce the dynamic energy consumption of which is induced by these values on the bus

an energy saving method based on frequent values and bit switching-aware for on-chip data bus is designed.Using the frequent values and the perception of the switching activities number

automatically selecting the encoding mode and so switching activities on the bus are significantly reduced

and therefore the bus dynamic energy is effectively reduced.With 70 nm technology

the results of simulation experiments show our method can improve the ratio of energy saving by about 17.76% and average ratio about 16.91%

and which is better than FV-MSB over 6.28%.And the trend of the energy saving ratio with shows that the method can still play the role when the technology size is further reduced in the future.