针对在西安地铁2号线列车调试中出现的停放制动施加时允许牵引造成的擦轮事故，从控制、监视和司机操作方面对故障原因进行分析。并提出应对措施：为避免在新项目中发生此类故障，应从设计逻辑的严密性和操作人员的针对性培训方面采取相应措施。

This paper focuses on friction accidents of wheels while parking brake was operated during the tests of trains for Xi’an metro Line 2，analyzes the true reasons for the friction accidents in terms of controlling，monitoring and driving and puts forward countermeasures． To avoid the breakdown，the author deems that corresponding measures should be taken from the aspect of strictness in design logic and purposeful training of operators．