Song Qing is a character in the novel Water Margin, one of the Liangshan heroes, and the younger brother of Song Jiang, the leader of Liangshan Bo. After Juyi in Liangshan, it ranked 76th, nicknamed Iron Fan, with an asterisk.

At present, there are probably four explanations for Song Qing's nickname "Iron Fan", namely "waste theory", "cover-up theory", "reliability theory" and "management theory".

1, "Abolishment Theory" mainly originated from Cheng Muheng in Qing Dynasty and Zhang Henshui in Republic of China. "Fans made of iron are useless waste." Modern scholars basically disagree with this view.

2. "Cover theory" comes from the paper "Heroes of the Water Margin" published by Mr. Wang Qili in 1950s, which has a great influence. People think that "iron fan" has a defensive function, which means that Song Qing has the function of shielding and supporting his brother Song Jiang.

3. Although the "reliability theory" and "management theory" are derived in different ways, their conclusions are similar. They all think that this nickname shows that Song Qing is good at managing housework and is a suitable candidate for logistics management.