Not necessarily, if there is a legal marriage in either of the two marriages, that is, a registered marriage, it will constitute the crime of bigamy. If both marriages are de facto, it will not constitute the crime of bigamy in law. Our country's law clearly stipulates that the identification of bigamy crime is one party's occurrence during the existence of marriage relationship, and the de facto marriage does not constitute a legal marriage relationship, so it is impossible to constitute the crime fact of bigamy.
 However, if the first de facto marriage was concluded before February 1, 1994, the second de facto marriage should constitute the crime of bigamy.
 [Legal Basis]
 Article 258 of the Criminal Law stipulates that a person who has a spouse and remarries, or knowingly marries another person who has a spouse, shall be sentenced to fixed-term imprisonment of not more than two years or criminal detention.