Abstract: Chinese is a tone language，and the different tone in one same syllable band represents the different meaning.The phenomena that the tone value of tone class in the syllable changes occurs when two or plural syllables of tone language connect each other，and the phenomena is called “tone sandhi”.Current speech synthesize systems do not consider the tone sandhi，which causes the naturalness of synthesized speech is not high.This paper synthesizes the speech with the tone sandhi using TD-PSOLA.The experimental results show that the naturalness of synthesized speech is high，and the proposed algorithm is an excellent algorithm of speech synthesizing for a small size of samples database.