This paper carried through special ultrasonic test study for defects forming cause andframework' characteristic of cone cabin made by carbon fiber composite material. Firstly,many kinds of destructive test methods are compared, and C-scan ultrasonic test methodand A-scan ultrasonic test method are adopt to examine the defects of the part ofnonmetal composite material. It can ensure the requirement of quantitative test for conecabin and other parts made by carbon fiber composite material after tes...