1. Artistic value of works: Guo Chunlei's calligraphy works have unique style and exquisite brushwork, which can convey the author's unique aesthetics and charm, so they have high artistic value.
2. Market and social recognition: Guo Chunlei is well-known and influential, and his calligraphy works enjoy certain market and social recognition in the field of calligraphy art.
3. Materials and preservation conditions: The materials and preservation conditions of artworks also determine their collection value.