郑兴,又名郑汉卿,1885年生于山东省博山县(今淄博市)五福峪村。因家境贫寒,郑兴18岁闯关东,先后在沈阳邮电局当邮差、电话工。1921年9月他考取吉林警官学校,1925年7月毕业被派往中朝边境的延吉县二道沟(今和龙市西城镇)警察署任外事警官,后升任珲春县警察署署长。1931年九一八事变后,王德林举旗抗日,1932年2月8日在延吉县小城子(今汪清县春阳镇)成立"中国国民救国 Zheng Xing, also known as Zheng Hanqing, born in 1885 in Boshan County, Shandong Province (now Zibo City) Wufu Yu village. Due to poor family, Zheng Xing 18 years old break through the East, has post in Shenyang Post Office, telephone workers. In September 1921 he was admitted to the Jilin Police Academy. In July 1925, he was sent to the police department of Erdaogou (present-day Xilong town) in Yanji County on the border between China and North Korea as foreign affairs officer and later to the director of the police department of Hunchun County. After the September 18th Incident of 1931, Wang Delin raised his banner against Japan. On February 8, 1932, he set up a small town in Yanji County (now Chunyang Town, Wangqing County)