structural:reformatting
Sources of foreign cultural influence

Through the centuries, Cham culture and society were influenced by forces emanating from Cambodia, China, Java and India amongst others. An official successfully revolted against Chinese rule in modern central Vietnam, and Lâm Ấp, a predecessor state in the region, began its existence in 192 CE. In the 4th century CE, wars with the neighbouring Kingdom of Funan in Cambodia and the acquisition of Funanese territory led to the infusion of Indian culture into Cham society. Sanskrit was adopted as a scholarly language, and Hinduism, especially Shaivism, became the state religion. Starting from the 10th century CE, the Arab maritime trade introduces Islamic cultural and religious influences to the region. Although Hinduism was the predominant religion among the Cham people until the 16th century, Islam began to attract large numbers of Chams, when some members of the Cham royalty converted to Islam in the 17th century. Champa came to serve as an important link in the spice trade, which stretched from the Persian Gulf to South China, and later in the Arab maritime routes in Mainland Southeast Asia as a supplier of aloe.

Despite the frequent wars between the Cham and the Khmer, the two nations also traded and their cultural influences moved in the same directions. Since royal families of the two countries intermarried frequently. Champa also had close trade and cultural relations with the powerful maritime empire of Srivijaya and later with the Majapahit of the Malay Archipelago, its easternmost trade relations being with the kingdoms of Ma-i. Butuan, and Sulu in the Philippines.

Evidence gathered from linguistic studies around Aceh confirms that a very strong Chamic cultural influence existed in Indonesia; this is indicated by the use of the Chamic language Acehnese as the main language in the coastal regions of Aceh. Linguists believe the Acehnese language, a descendant of the Proto-Chamic language, separated from the Chamic tongue sometime in the 1st millennium BCE. However, scholarly views on the precise nature of Aceh-Chamic relations vary. Tsat, a northern Chamic language spoken by the Utsul on the Hainan Island, is speculated to be separated from Cham at the time when contact between Champa and Islam had grown considerably, but precise details remain inadequate. Under Chinese language influence over Hainan, Tsat has become fully monosyllabic, while some certain shifts to monosyllabicity can be observed in Eastern Cham (in contact with Vietnamese). Eastern Cham has developed a quasi-registral, incipiently tonal system. After the fall of Vijaya Champa in 1471, another group of Cham and Chamic might have moved west, forming Haroi, which has reversal Bahnaric linguistic influences.