1, a said to be related to the sacrifice of Dayu, when Dayu with the method of dredging, so that the three rivers into the sea, Taihu Lake water level fell, floods can be calmed, for the planting of winter wheat to create the conditions for the people of Suzhou love. During the Qingming Festival, when the winter wheat returns to the green, the glutinous rice powder is dyed green to show that they do not forget the grace of Dayu's water control.

2, a said to be related to Patrick Lee. Legend has it that one year during the Ching Ming Festival, Chen Taiping, the powerful general of Li Xiu Cheng of the Taiping Heavenly Kingdom, was pursued by the Qing soldiers, and a nearby farmer disguised Chen Taiping as a farmer and plowed the land with himself. When Chen Taiping was not captured, the Qing soldiers set up guards in the village, checking everyone who left the village and preventing them from bringing food to Chen Taiping. After returning home, the farmer was thinking about what to bring Chen Taiping to eat when he stepped on a clump of mugwort, slipped and fell, and when he got up his hands and knees were stained with a greenish color. He hurriedly picked some mugwort and went home to wash and boil it, squeezed the juice, kneaded it into glutinous rice flour to make rice dumplings, and then put the green dumplings in the grass to muddle through the sentries at the entrance of the village. Chen Taiping ate the dumplings and found them fragrant, sticky and non-sticky. After dark, he bypassed the Qing sentries and returned safely to the base camp. Later, Li Xiu Cheng ordered the Taiping army to learn how to make green dumplings to protect themselves from the enemy. The custom of eating green dumplings was then spread.