Cai Lun invented papermaking, Bi Sheng invented movable type printing, and Taoism invented gunpowder and compass.

Cai Lun invented papermaking in the first year of Yuan Xing in the Eastern Han Dynasty (105). He made paper from bark, hemp head, cloth, fishing net and other raw materials through crushing, ramming, papermaking and baking, which is the origin of modern paper. This kind of paper is easy to find, cheap and has improved its quality, so it is gradually widely used. In order to commemorate Cai Lun's achievements, later generations called this kind of paper "Cai Hou Paper".

Printing is one of the four great inventions of Han working people in ancient China. Printing originated from Taoist woodcut printing and was active in woodcut printing in Tang Dynasty. In the Song Renzong era, it was developed and perfected by Bi Sheng, resulting in movable type printing, which was spread to Europe by Mongols, so people later called Bi Sheng the ancestor of printing. China's printing is the pioneer of modern human civilization, which has created conditions for the wide spread and exchange of knowledge. Printing first spread to Korea, Japan, Central Asia, West Asia and Europe. The invention of movable type printing is a great technological revolution in the history of printing. The method of movable type printing is to make the positive and negative character patterns of single words first, then select the single words according to the original manuscript, arrange them in the font plate, ink them, and then remove the font after printing, so as to use them again in the next typesetting.

Gunpowder is one of the four great inventions in China. It is a substance that can burn quickly and regularly under the action of appropriate external energy, and at the same time produce a large number of high-temperature gases. Militarily, it is mainly used as the propellant of bullets and shells, the propellant of rockets and missiles and the energy source of other driving devices, which is an important part of ammunition. Outstanding achievements in the history of human civilization. Because of its lethality and shocking power, gunpowder is one of the important inventions of human civilization, which has brought the functions of relieving armistice and security defense to mankind.

Compass is the result of the understanding of the magnetism of objects by the working people of ancient Han nationality in long-term practice. As one of four great inventions of ancient china, its invention has played an inestimable role in the development of human science, technology and civilization. In ancient China, the compass was first used for rituals, etiquette, military affairs and divination, and to determine the orientation when looking at geomantic omen. Cai Lun invented papermaking, Bi Sheng invented movable type printing, and Taoism invented gunpowder and compass.

Cai Lun invented papermaking in the first year of Yuan Xing in the Eastern Han Dynasty (105). He made paper from bark, hemp head, cloth, fishing net and other raw materials through crushing, ramming, papermaking and baking, which is the origin of modern paper. This kind of paper is easy to find, cheap and has improved its quality, so it is gradually widely used. In order to commemorate Cai Lun's achievements, later generations called this kind of paper "Cai Hou Paper".

Printing is one of the four great inventions of Han working people in ancient China. Printing originated from Taoist woodcut printing and was active in woodcut printing in Tang Dynasty. In the Song Renzong era, it was developed and perfected by Bi Sheng, resulting in movable type printing, which was spread to Europe by Mongols, so people later called Bi Sheng the ancestor of printing. China's printing is the pioneer of modern human civilization, which has created conditions for the wide spread and exchange of knowledge. Printing first spread to Korea, Japan, Central Asia, West Asia and Europe. The invention of movable type printing is a great technological revolution in the history of printing. The method of movable type printing is to make the positive and negative character patterns of single words first, then select the single words according to the original manuscript, arrange them in the font plate, ink them, and then remove the font after printing, so as to use them again in the next typesetting.

Gunpowder is one of the four great inventions in China. It is a substance that can burn quickly and regularly under the action of appropriate external energy, and at the same time produce a large number of high-temperature gases. Militarily, it is mainly used as the propellant of bullets and shells, the propellant of rockets and missiles and the energy source of other driving devices, which is an important part of ammunition. Outstanding achievements in the history of human civilization. Because of its lethality and shocking power, gunpowder is one of the important inventions of human civilization, which has brought the functions of relieving armistice and security defense to mankind.

Compass is the result of the understanding of the magnetism of objects by the working people of ancient Han nationality in long-term practice. As one of four great inventions of ancient china, its invention has played an inestimable role in the development of human science, technology and civilization. In ancient China, the compass was first used for rituals, etiquette, military affairs and divination, and to determine the orientation when looking at geomantic omen.