Objective: Analysis the influence factors of the voice print identification, verify whether the selected syllables were optimal. Methods: Compare pronouncing differences of the same words between different people. Compare differences of the same word read by one person in different dialects, the authenticity of the voice, the impact of recording equipments on the identification of voice print. And analyze the results. Results: Determine the authenticity of the voice, identify the speaker' s information and verify whether the selected svllables were ontimal.