Yes, historically, the Han Chinese have predominantly married within their own ethnic group. The term "Han Chinese" refers to the largest ethnic group in China, comprising over 90% of the country's population. Like many other societies, the Han Chinese have generally practiced endogamy, which means they tend to marry within their own ethnic, cultural, or social group.
Marriage customs and practices have evolved over time, and there have been variations within different regions and historical periods. However, the overall trend has been to marry within the same ethnic group, and this continues to be the case for the majority of Han Chinese individuals.
It's important to note that with increased globalization, migration, and intercultural interactions, there may be exceptions to this general pattern, and some Han Chinese individuals may marry people from different ethnic backgrounds or cultural origins. However, as a whole, the Han Chinese have historically preferred to marry within their own kind, maintaining their distinct ethnic and cultural identity.