Abstract: Polypyrrole/ polyaniline microtubules were prepared by using the chemical method. The influencing factorsincluding ratio of pyrrole/ aniline , adding method of aniline , concent ration of β-NSA and adding speed of APS werestudied through SEM. The result s show that the optimum preparing condition of polypyrrole/ aniline microtubules isthat pyrrole/ aniline is 1∶3 , adding speed of aniline is 1drop/ min , concent ration of β-NSA is 0. 6 mol/ L , and addingspeed of APS is 0.5 drop/ min. Pyrrole controlled the size of polypyrrole/ polyaniline microtubules in the process of reaction.