The Holy Dragon Flower Church of the Heart-bound Heavenly Way (一心天道龙华圣教会 Yīxīn tiāndào lónghuá shèng jiàohuì), also known simply as Yixin Tiandao (一心天道 "Heart-bound Heavenly Way"), Yizhendao (一真道 "Way of the One Truth") or the Holy Church of the One Truth (一真圣教会 Yīzhēn shèng jiàohuì), or Changmaodao (长毛道 "Way of the Long Hair"),[1] is a Chinese folk religious sect part of the Xiantiandao tradition.

[2] The first hall of the religion (一心堂 yīxīn táng, "one-heart hall") was founded in 1913 by Ma Shiwei (马士伟) in the Zouping County of Shandong.

[1][3] In 1917 the One-Heart movement expanded opening a branch in Shanxi, and in 1922 it started a branch in Hebei.

Its headquarters were located in Wutai County (Shanxi) and Jinan (Shandong).

[1] In 1937 the first congregation was established in Shanghai.