Objective To test reliability and validity of a verbal behavior assessment scale (VerBAS). Methods The VerBAS was used to evaluate 20 patients with speech disorder repeatedly by the same investigator with a two week interval to assess its reliability. The construct validity of the VerBAS was evaluated by using it to evaluate 235 patients with speech disorder. Results The test-retest correlation coefficient γ was 0.723,which was significant at the 5% confidence level. Cronbach'a a=0.819. Three distinct factors were identified: receptive speech,communicative speech and delineative speech;and their accumulated variance contribution was 83%. Conclusion The Verbal Behavior Assessment Scale had satisfactory reliability and validity, It can be used to evaluate the patients with speech disorder and could provide a reference for speech rehabilitation training.