Group of the Cham Temples and Towers were built in the end of VIII century and beginning of IX century by the Cham people, it's belong to Hoa Lai Art Architecture style and it's is also a soon style in art history of Champa Kingdom. This is a relative undamaged vestige which remains in over 100 years of development of this style.
Purpose of this building is to worship God of Shiva, one of Hinduisms Gods venerated and admired by the Cham people. The incarnation of this God is altar of Linga - Yoni in main tower and same date with this group of towers.
In the end of XIX century and the beginning of XX century, the tower named Pho Hai (named according to place-name of Pho Hai Hamlet). Together with name of Pho Hai, group of towers also named Po Sah Intf, according to legend of Cham ethnic, Po Sah Intf Princess and her brother Po Dam (Po Tam), Vietnamese called Tra Duyet, are son and daughter of Parachanh King, Vietnamese history called La Khai, an inherits General of Che Bong Nga. When she died, the Cham worshiped her here, so this tower is called Po Sah Intf tower. Vestige of temples was discovered through archaeological exhumations in 1990, 1993, 1994, and 1995.
In 1989-1990, Subcommittee of cooperation of Vietnam - Poland for repairing and restoring Cham vestige architecture pressingly researched and reinforced to prevent collapse of whole groups. In next of 1995, 1996, 1997 and 1998, they repaired, embellished towers in the same group found out in archaeological exhumations and system of wall surrounding the vestige. Basically, the old stature of vestige was returned; seriously downgraded items were also fixed; these activities bring firm, stability and extend longevity for vestige.
Over 2/3 of the last century, generations of the Cham have performed rites annual, especially Kate Carnival. Because of history causes, carnival has been scattered gradually. Until 2005, Kate carnival was set up in compliance with original content. And until present, in 01 July of Cham's Calendar (approximately of October of Solar calendar), dignitaries and Cham's people in hamlets of Ham Phu, Ma Lam and Ham Tri Commune of Ham Thuan Вас District, Binh Thuan Province come here and organize Kate Carnival in accordance with tradition of their ancestor.