In 1618 Tibetan King Garma Dunjoin Wangbo allied with the 10th Garmaba Yindo and overthrew the Pagmo Zhuba Regime. Garma Dunjoin styled himself Tsangdui Khan and founded the Garma Gagyu Regime. In order to better rule Bhutan, he sent several lamas with a monastery belonging to the Gagyu Sect to a monastery called Purlhakang. One of these lamas was a forefather of the Parlha clan.

In 1642, the 5th Dalai Lama Ngawang Lobsang Gyamco crushed the political power of the Garma Gagyu Sect with the support of the Mongol Gushri Khan, and founded the Gandain Phodrang Regime of the Gelug Sect. Unwilling to accept the defeat, Garma Dunjoin Wangbo's forces, twice in 1642 and 1644, led by Garba raised insurrection in the Gongbo area and the southern part of the U-Tsang. The Prince of Dharma in Bhutan, who refused to accept the 5th Dalai Lama's rule, gave full support to Garba. In these circumstances, Gushri Khan and the 5th Dalai sent troops to Bhutan and, at the same time, worked hard to persuade Ngashang Guchin (a descedant of the Parlha clan) who was a lama at Pulhakang to surrender to the Tibetan local government. Later on, Ngashang Guchin did lead some 500 households to surrender to the Tibetan authorities. In return, the Tibetan government bestowed a part of the area under the jurisdiction of Gyangze to the Parlha clan, enabling it to climb up the social ladder and become a noble family.

Offspring of Ngashang Guchin served in the local government of Tibet.Those, led by Dainzin Namgyi, distinguished themselves in fighting foreign invaders and hence were honored as Galoons. During the Qing Dynasty, some clan members were given official titles as the clan gained power and wealth.

In 1887, the wife of both Zhaxi Dagyi and his brother Depoin Parlha was punished by the Tibetan government for collecting military information for the British, with part of the land being confiscated and the two husbands exiled for seven years. from then on, the Parlha clan declined step by step.

The Parlha clan had begun to regain force by 1959. At that time, the clan had three men and three women: The first, Tubdain Weidain served as the secretary general of the 14th Dalai Lama (he later became a Galoon of the government-in-exile of the 14th Dalai Lama); the second, Zhaxi Wangqug, served as a fourth ranking official of the local government of Tibet; the third, Wangqug, served as the commander of Garrison Regiment of the government-in-exile of the 14th Dalai Lama. Two daughters of the first and second both married two nobles respectively in Lhasa and Xigaze. The three both fled abroad after 1959 and died there.