自2019年4月1日起，中国民政机构将不再为双方均为外籍的人员办理婚姻登记并出具中国结婚证。一方为外籍另一方为中国公民的仍可正常办理婚姻登记。此新规定于2019年3月29日颁布，已在全国范围内生效。有关此规定的详情请点击中国民政部的网站http://www.mca.gov.cn/article/xw/tzgg/201903/20190300016006.shtml （仅有中文信息）或拨打他们的热线电话962200咨询。
美国公民与中国公民在中国登记结婚之前，应先了解相关的中国政府办事程序。在中国结婚需根据中国相关法律进行登记。与普遍的看法不同，美国外交官员和使馆官员无权主持婚礼并见证婚姻。原因在于，根据美国宪法，管理民政事务的权利分属各州。因此，禁止美国联邦政府雇员、美国使馆官员越权，侵犯各州的职责。
现行的《中华人民共和国婚姻法》要求结婚登记手续由各地民政局婚姻登记处完成。计划结婚的美国公民应该在其未婚夫/妻户口所在地的婚姻登记处咨询并办理。
收到登记结婚申请后，民政部门将核实双方是否达到最低结婚年龄（尽管某些地方民政部门确定的最低年龄可能略高，但一般应达到男22岁，女20岁），双方是否单身或能够自由结婚。有过婚史的人需要提交离婚证明或前配偶死亡证明的原件或经过公证的复印件。办理结婚登记时，当地婚姻登记处通常会要求美国公民一方提供下列材料：
如要了解登记结婚的中国公民需提交哪些文件，请咨询其户口所在地的婚姻登记处。通常情况下，结婚证在申请当日发放。在婚姻登记辖区视为合法的婚姻在美国同样合法，无须在美国重复结婚。

As of April 1, 2019, two foreigners are not allowed to register their marriage at Civil Affairs offices in China (marriages between a foreigner and Chinese national are still permitted.)  This means that two foreigners can no longer obtain a Chinese marriage certificate.  This new regulation was published on March 29, 2019, and went into effect nationwide as of today.  The details of this announcement can be found here: http://www.mca.gov.cn/article/xw/tzgg/201903/20190300016006.shtml (in Chinese only)  or you can call the Civil Affairs hotline at 962200. 
U.S. citizens contemplating marriage to a Chinese citizen in China should review the following information. This information is given for general background reference only.  You or your fiancée should check with local authorities for any changes that might have been made. Marriages in China are registered according to the laws of China.  U.S. diplomatic and consular officers do not have the authority to perform marriages and are not required to witness the marriages of U.S. citizens that take place overseas. Under the U.S. Constitution, the administration of civil affairs is one of the powers reserved for states.  Thus, as federal government employees, U.S. consular officers are prohibited from usurping this state role.
Marriages in China are administered by the marriage registration office of the local civil affairs bureau, (民政局Min Zheng Ju) in each jurisdiction.  People planning to marry should visit or call one of these offices for specific information. The appropriate civil affairs office will be the one in the jurisdiction in which the Chinese citizen is registered (the location of their 户口hukou).
While the minimum age for marriage is generally 20 for women and 22 for men, some civil affairs offices may have a higher minimum age.  Both parties must establish that they are single and free to marry.  If you have been previously married, you will be asked to submit original or certified copies of your final divorce or annulment decrees, or of death certificates, if widowed.  Note that at least one party of a marriage must be a Chinese citizen. The U.S. citizen will usually be asked by the local authorities to submit the following documentation in order to be married:
Questions regarding what documents the Chinese partner must submit should be directed to the local marriage registration office (Hun Yin Deng Ji Chu 婚姻登记处).
Marriage certificates are usually issued on the same day the registration takes place.  Marriages that are legal in the jurisdiction in which they were performed are legal in the United States.  It is not necessary to register your marriage at the Embassy, Consulate, or in the United States, nor do you need to re-marry in the United States.