Abstract: To solve problems of current bevel gear measurement,the authors developed a CNC-type bevel gear deviations measuring machine,and achieved high precision and efficient inspection.This paper presents the principle of measurement and the configuration of the machine,expounds the measurement technology and the evaluation of bevel gear individual errors,and proposes the mathematical formula of runout derived from pitch error.The formula is based on the analysis between bevel gear pitch error measurement and traditional runout measurement.