Dapiao oubi 大瓢偶筆 is a book on calligraphy written during the late Qing period 清 (1644-1911) by Yang Bin 楊賓 (1650-1740), courtesy name Keshuai 可帥, style Gengfu 耕夫, Dapiao 大瓢 or Xiaotie 小鐵, from Shanyin 山陰, Zhejiang. It was reorganised by Yang Pei 楊霈, courtesy name Weinong 慰農, from Tieling 鐵嶺, Liaoning. Yang Bin also wrote the books Saiwai shi 塞外詩, Tiehanzhai shuba 鐵函齋書跋, Jiating jishu 家庭紀述, Jinshi yuanliu 金石源流, Shuyao 書要 and Liubian jilüe 柳邊紀略.
The original manuscript had been written down just as Yang Bin proceeded with his studies. Yang Pei added commentaries to these notes and arranged the artworks in chronological order and by art genre. He also rectified errors in Yang Bin's notes. The result of Yang Pei's revision is a book of 8 juan in length. It starts with stele inscriptions and model calligraphies (bei tie 碑帖) from the Zhou 周 (11th cent.-221 BCE) to the time of southern and northern division (juan 1), followed by the famous Jin-period calligraphies (2), Tang-period 唐 (618-907) stone tablet inscriptions (3-4), calligraphies from the Song 宋 (960-1279), Yuan 元 (1279-1368), and Ming 明 (1368-1644) periods (5), Qing-period artworks (6), methods of the brush (bifa 筆法), the use of ink (bimo 筆墨), and painting (jihua 記畫) from the Qing period (7), and various notes on calligraphy (Oubi shiyu 偶筆識餘; 8). The structure of the book resembles that of many texts on bronze and stone inscriptions. It includes detailed discussions, exquisite proofs, and insightful arguments.
The manuscript had a preface dated 1708, but it was first printed in 1847 by the Liangdao Shu 糧道署 in Guangdong. The Yunshi Shanfang 筠石山房 published another print.