Lu Dian arranged the Piya into 8 semantically-based chapters that closely correspond with the last Erya chapters 13-19. The only exceptions are Chapter 5 ("Explaining Horses") that is contained in Erya 19 ("Explaining Domestic Animals") and Chapter 8 ("Explaining Heaven") that anomalously corresponds with the first part of the Erya.
| Chapter | Chinese | Pinyin | Translation | Erya Chapter |
|---|---|---|---|---|
| 1 | 釋魚 | Shiyu | Explaining Fishes | 16 |
| 2 | 釋獸 | Shishou | Explaining Beasts | 18 |
| 3 | 釋鳥 | Shiniao | Explaining Birds | 17 |
| 4 | 釋蟲 | Shichong | Explaining Insects | 15 |
| 5 | 釋馬 | Shima | Explaining Horses | (19) |
| 6 | 釋木 | Shimu | Explaining Trees | 14 |
| 7 | 釋草 | Shicao | Explaining Plants | 13 |
| 8 | 釋天 | Shitian | Explaining Heaven | 8 |
The preface explains Lu's motives for defining flora and fauna terminology. Since Song officials changed the basis for the Imperial examination from mastering poetry to jingyi (經義/经义 "expounding on a classical quotation"), literati no longer studied the lyrical names for plants and animals.