According to the inquiry, there was a ceremony to change the mouth at Pingdu wedding. In the old days, prostitutes could not attend, so they usually changed their minds when they visited heaven and earth. Nowadays, many prostitutes inspect houses in person. If this kind of marriage is recognized, they will be renamed as the parents of the man and the parents-in-law will give "money change".

Pingdu city established Tangyi and Jimo in the Spring and Autumn Period and the Warring States Period. Qin set up Jiaodong County and Jimo County. In the Western Han Dynasty, Jimo, Yuzhi, Luxiang, Pingdu and Xiami counties were established. Jiaoxian County was established from Tang Dynasty to Yuan Dynasty, Pingdu Prefecture was established in Ming and Qing Dynasties, and Pingdu was changed to a county in the second year of the Republic of China. 1983, Weifang was placed under the jurisdiction of Qingdao. 1989 Withdraw county and set up city. 202 1 year pingdu city resident population 1 187800.