Why is the jian considered more technically demanding to forge than a dao?

 Updated Feb 2026

The jian's double-edged, symmetrical cross-section requires a level of geometric precision in the forging and grinding process that single-edged blades do not demand. A dao has one cutting edge and one spine - the two sides of the blade can be worked independently, and asymmetry between them is not a quality issue but a design feature. A jian has two cutting edges that must be ground to matching angles from a blade center line that must itself be perfectly straight. Any deviation from the center line is visible as an asymmetry that affects both the appearance and the performance of the blade. The double-edge also means both sides of the blade are sharpened through the full length, which requires more careful stock removal and edge work than a single-edged blade. The cross-section of a quality jian is typically diamond or lenticular - a profile that requires consistent material removal on both sides simultaneously to maintain the center line. For these reasons, experienced smiths who work in both dao and jian forms typically acknowledge the jian as the more technically demanding of the two, which is part of why it carried such prestige in Chinese martial tradition.