The invention relates to a voice code optimization method based on G.729 algorithm and applicable to an embedded system. The method comprises the following steps of: when searching a corresponding code value with the G.729 algorithm, limiting the searching range to the vicinity of candidate delay obtained by open-loop pitch analysis, and carrying out one-time open-loop pitch analysis to each frame of voice data to obtain the characteristic parameters of 10 ms and 80 sampling points of each frame of voice data; reducing the cumulative frequency from the original 80 times to 40 times, comparingthe maximum related coefficient values, and normalizing the maximum values; and quantizing by using LSF of w in a frequency domain [0, pi] by an LSP coefficient. The method can reduce the complexity of the algorithm, reduce the calculation quantity, lower the requirements for hardware and improve the coding efficiency.