There are many ways to classify Wenwan walnuts, and people have different opinions. I mainly classify them from the following aspects:

1. According to the growing area, there are North China walnuts; Northwest walnuts; Northeast walnuts; Southwest Walnut.

2. According to the growth conditions, there are wild walnuts and grafted walnuts.

3. According to the varieties, there are lion heads, tiger heads, official hats, young master hats, chicken hearts, Arhat heads, monk hats, champion crowns, autumn seeds, iron walnuts, lanterns, etc.

4. According to the edges, there are two-sided walnuts; three-sided walnuts; four-sided walnuts; five-sided walnuts, etc.

5. According to the texture, there are coarse-grained walnuts; fine-grained walnuts; dark-grained walnuts; light-grained walnuts; water-ribbed walnuts; baby's breath walnuts, etc.

6. According to height, there are high pile walnuts and short pile walnuts.

7. According to the sides, there are large-sided walnuts; small-sided walnuts; thick-sided walnuts; thin-sided walnuts, etc.

8. According to the tip, there are dull-pointed walnuts and large-pointed walnuts. 9. According to the deformity, there are two conjoined walnuts; three conjoined walnuts; eagle-beak walnuts, Buddha belly walnuts, Guanyin belly walnuts; Bird walnuts; mandarin duck walnuts, etc. 10. According to age, there are old walnuts (walnuts that were played with 30-50 years ago are generally called old walnuts); new walnuts, etc., refer to the play guide