Based on a series of rules and regulations on the construction of postgraduate tutors' ethics issued by The State Council, the Ministry of Education, Hebei Province and Hebei University of Engineering, this paper finds out 16 dimensions core elements of the construction of postgraduate tutors' ethics. Taking fishbone diagram method as an analysis tool, this paper divides the sixteen dimensions core factors of the postgraduate tutors' ethics into four categories and 20 small classes, draws a fishbone analysis diagram of the postgraduate tutors' ethics and style influencing factors, and lists the schedule of influencing factors of the postgraduate tutors' ethics and style. Taking Hebei University of Engineering as a case, this paper concludes the achievements and existing problems of postgraduate tutors' ethics according to the fishbone analysis diagram of the postgraduate tutor's ethics and style influence factors..Accordingly the paper offers implementation paths and countermeasures to optimize the tutor's ethics of Hebei University of Engineering by finding the key restricting factors through analyzing the fishbone diagram.