Definition

Lei Ji (类祭, Lèi Jì, lit. "Category Sacrifice") is an ancient Chinese ritual term for a Heaven-sacrifice performed on special or extraordinary occasions, distinguished from the regular suburban sacrifice (jiao si, 郊祀). The character lei (类) signifies that the ritual follows the proper category of Heaven-worship but with simplified provisions. As part of the broader Taoist cosmological framework that governs Heaven-Earth relations, Lei Ji was performed before military campaigns, imperial tours, in response to natural disasters, or to mark victories and regency accessions.

Classical Sources

The Shijing (诗经), "Da Ya: Huang Yi" (大雅·皇矣) records:

(Meaning: "They performed the Lei sacrifice and the Ma sacrifice; they presented [the captives] and attached [them].")

Zheng Xuan (郑玄) comments: "What is performed within [the state] is called Lei; what is performed outside [the state] is called Ma." Kong Yingda (孔颖达, 574–648 CE) elaborates: "At the beginning of sending out the troops, the Lei sacrifice is performed; at the location of the expedition, the Ma sacrifice is performed."

The Liji (礼记), "Wang Zhi" (王制) specifies:

(Meaning: "When the Son of Heaven is about to go out, he performs the Lei sacrifice to the Supreme Emperor.") Zheng Xuan notes that lei is the name of the sacrifice, adding that "its ritual form has been lost" — meaning that by the Han Dynasty the detailed procedures were no longer transmitted. Kong Yingda adds: "The Lei sacrifice to the Emperor means announcing and praying to Heaven. The Son of Heaven performing the Lei to the Emperor means sacrificing to the Five Virtue Emperors."

The Zhouli (周礼), "Chun Guan: Xiao Zong Bo" (春官·小宗伯) records another usage:

(Meaning: "For great calamities of Heaven and Earth, the Lei sacrifice is performed to the altars and ancestral temples, and positions are established.") This usage connects Lei Ji to the Yansheng Jiao tradition of propitiatory rites performed during times of national crisis.

Classification

The Lei Ji sacrifice encompasses several distinct occasions:

出征类祭 (chu zheng lei ji, "Expedition Lei Sacrifice"): Performed at the capital before the army departs, announcing the campaign to Heaven and seeking divine sanction.

巡狩类祭 (xun shou lei ji, "Imperial Tour Lei Sacrifice"): Performed before the emperor's inspection tour of the realm.

灾变类祭 (zai bian lei ji, "Calamity Lei Sacrifice"): Performed in response to natural disasters, praying to Heaven and the altars. This category finds a direct parallel in the Taoist tradition of fasting and offering sacrifices during floods, droughts, and epidemics.

告成类祭 (gao cheng lei ji, "Victory Lei Sacrifice"): Performed after military victory or upon the accession of a regent.

Kong Yingda notes that the Lei sacrifice in all cases follows the ritual form of the regular suburban sacrifice but with diminished offerings. Jia Gongyan explains: "Prayer and supplication rites are light in ritual weight. Although they follow the correct ritual category, the sacrificial provisions are somewhat reduced."

Zhengyi Perspective

In the Zhengyi tradition, the concept of the Lei Ji — performing Heaven-worship according to category but with adjusted provisions — resonates with the Taoist practice of adapting ritual to circumstance. The Zhengyi liturgical system includes various grades of ritual, from the grand jiao (大醮) to simpler supplication rites, each appropriate to the occasion. Understanding the full scope of Taoist sacred ritual helps illuminate how the Lei Ji logic was preserved and transformed within the living tradition.

The Lei Ji's use in disaster response finds a direct parallel in the Zhengyi tradition of performing propitiatory rites during floods, droughts, and epidemics. At Longhu Mountain, the Celestial Master's Mansion historically conducted special Heaven-invoking rituals during times of national calamity, following the same logic as the classical Lei Ji — performing the correct category of Heaven-worship with the appropriate level of ritual provision.

Related Concepts

• Jiao Si (郊祀, Jiāo Sì): The regular imperial suburban sacrifice to Heaven — the standard ritual from which Lei Ji is distinguished as an extraordinary variant. → See: Jiao Si: Imperial Suburban Sacrifice
• Gao Lei (告类, Gào Lèi): The imperial announcement offering closely related to Lei Ji, used to formally notify Heaven of major state events. → See: Gao Lei: Imperial Announcement Offering
• Sacred Ritual (科仪, Kē Yí): The broader liturgical tradition that preserves the logic of graded Heaven-worship across Taoist practice. → See: Sacred Ritual