Dharma nature chuan cheng;

              holy ancestral chuan cheng;

              different geographic location chuan cheng (Han, Tibetan, Mongolian); and

              supreme holy hidden treasure chuan cheng.

          Dharma nature chuan cheng further subdivides into:

              the zongxia three-bodied Dharma nature body transmissions of Vairocana Great Sun Dharma nature chuan cheng, Samantabhadra Tathagata Dharma nature chuan cheng, and Ahdharma Buddha Dharma nature chuan cheng.

          The holy ancestral chuan cheng of Holy Tantra Esoteric Buddhism subdivides into:

              zongxia ancestral masters chuan cheng;

              zongqian ancestral masters chuan cheng;

              zongwai ancestral masters chuan cheng; and

              jiaoxia ancestral masters chuan cheng.

          Since the chuan cheng of Holy Tantra Esoteric Buddhism is itself a major scholarly subject, it is difficult for those lacking comprehension to really understand what it is all about.

          China's Holy Tantra Esoteric Buddhism chuan cheng, as separated by geographical localities, subdivides into:

              Han transmission Esoterically Esoteric chuan cheng;

              Tibetan transmission Esoterically Esoteric chuan cheng; and

              Mongolian transmission Esoterically Esoteric chuan cheng.

          They are referring to:

              Han transmission Holy Tantra Esoteric Buddhism;

              Tibetan transmission Holy Tantra Esoteric Buddhism; and

              Mongolian transmission Holy Tantra Esoteric Buddhism.

          According to the form in delivering and receiving of the chuan cheng, there is a division of revealed chuan cheng and concealed chuan cheng.

          Concealed chuan cheng is classified into twelve types of "supreme hidden treasure chuan cheng", such as "snow treasure chuan cheng", "rock treasure chuan cheng", "water treasure chuan cheng", "sunyata treasure chuan cheng" ...

          It is necessary to penetrate and comprehend the system of Holy Tantra Esoteric Buddhism chuan cheng in order to further discern the supreme meanings of various Holy Tantra Esoteric Dharma such as Holy Tantra Esoteric Buddhist doctrine, teachings, twelve vehicle classification of Buddhism, Holy Tantra Dharmata thirteen disciplines, dynamic and tranquil dharani (Holy Tantra Body Dharani, Holy Tantra Speech Dharani, Holy Tantra Mind Dharani), Vidyadhara Mind Tantra Commanding Great Zongchi, Vidyadhara Zongchi Holy Tantra Great Healer Lord, all Mandalas, all Dharma realms, ... etc.  It is the necessary route to subtlely assess the profundity of Holy Tantra Esoteric Buddhism's systematic true practice Dharma.

          The holy ancestral masters of Holy Tantra Esoteric Buddhism, although honoured as national teachers during the Tang dynasty and directed China's exoteric and esoteric Sangha in conducting dharani, forming mandala, chanting mantras, and practising Tantric meditation, under the adverse conditions which went against historical trend, from when emperor Tang Wu-zong resorted to exterminate Buddhism by demolishing monasteries and slaying Sangha members, for over a thousand years, Holy Tantra Esoteric Buddhism has all along waned from public view, left the monasteries and merged with the secular world, discarded the sangha gem appearance, and avoided outward arrangements in order to further extend the Holy Tantra bloodline.  During this harsh and difficult historical process, Holy Tantra practitioners, Holy Tantra gurus, and Holy Tantra elder gurus have been aware of life's linkage with chuan cheng Dharma lineage.  Protection of the secrecy of chuan cheng Dharma lineage has become a professional art and survival wisdom of Holy Tantra Esoteric Buddhism to operate safely in the deliverance of sentient beings and dissemination of Tantric teachings.