大风起于清萍之末。1936年12月9日，在著名的“一二·九”运动一周年纪念日的日子里，西安广大的爱国青年学生隆重纪念，并举行大规模的示威游行。这自然瞒不过特务的视线，蒋介石在事前就已经得到了报告。他命令西安的军、警、宪、特加强戒备，严密防范，不准学生游行，更不准 Gale at the end of Qing Ping. On December 9, 1936, on the anniversary of the famous “January 9” campaign, a large number of patriotic young students in Xi’an were solemnly commemorated and large-scale demonstrations were held. This naturally hides the sight of the spy and Chiang Kai-shek has already been reported in advance. He ordered the military, police and constitutional police in Xi’an to step up their vigilance and guard against it closely.