The development of seal script has produced two characteristics: first, the lines with uneven thickness in the early days became uniform and soft, and the lines they drew with utensils were very concise and vivid; Second, standardization, the glyph structure tends to be neat, and gradually deviates from the original shape of the picture, laying the foundation for the square characters.
Da Zhuan largely retains the writing style of the late Western Zhou Dynasty, but slightly changes, making the strokes more neat and symmetrical. The strokes are round. The lines are more uniform than the bronze inscriptions, and the lines have reached a complete level, with no obvious unevenness in thickness. The body structure is more neat than the bronze inscriptions, and it began to get rid of the shackles of hieroglyphics, laying the foundation for square Chinese characters. There are few variants on the same object. The font is complex, the radicals often overlap, and writing is inconvenient.