In connection with the problem that the existing TD-LTE terminal instruments aren’t able to optimize the downlink peak rate for slow channel coding processing speed

based on the intensive research on RM algorithm of 3GPP protocol

a fast RM implementation scheme with DSP chip is proposed in order to optimize the downlink channel coding.The scheme draws on the address replacement instead of data permutation to reduce the processing delay.Comparing with the original scheme on execution time

this paper proves that the fast scheme has a smaller processing delay.This scheme promotes the TD-LTE terminal test instruments running with downlink peak rate

and provides the impetus to accelerate LTE development.