1. Form order method-form order checking method, which is a method to arrange and retrieve words according to the shape and structure of Chinese characters. There are three commonly used methods: radical method, stroke method and stroke method.
2. Coding method-coding sorting method is a method of arranging titles in order according to the different physical structures of Chinese characters and replacing them with numbers. Commonly used are four-corner numbering method and pen code method.
3. Phonetic order method-Phonetic order check method, Phonetic order search method, retrieval method of arranging reference book words in order of Chinese pronunciation and alphabetical order or only in alphabetical order of foreign languages. Commonly used are Chinese Pinyin Sorting, Mandarin Phonetic Sorting, Rhyme Sorting and Foreign Language Sorting.
Second, official script, according to legend, was compiled by Cheng Miao in prison. By eliminating complexity and simplifying, the font becomes round and square, and the strokes become straight. Changing "Lian Bi" into "broken pen" and changing lines into strokes will make it easier to write. This kind of writing is popular among "Tuli" (small officials in lower official positions), so it is called official script. In the Han dynasty, this writing was more convenient. It laid the foundation of regular script. The structure of official script is flat, neat and exquisite. In the Eastern Han Dynasty, stippling was beautified as upward provocation to varying degrees, which enhanced the aesthetic feeling of the plastic arts of calligraphy, with diverse styles and greatly improved the artistic appreciation value. "Li bian" is an important watershed in the development history of Chinese characters. Compared with Xiao Zhuan, the graphic form of Li Shu is weakened and its symbolism is greatly enhanced, which lays a foundation for the development of Chinese characters.
I don't know if the "characteristics of official script" you asked is from the perspective of philology or calligraphy.
Please refer to: /b /b/796889.html for the angle of calligraphy.