This paper delineates the style of judicial documents-from the writing format to the final appearance-of the Alasa Banner (qosiyu) in Mongolia during the Qing Dynasty, and compares them with documents of other banner's. Existing studies of public documents of the Qing Dynasty in Mongolia focus on those exchanged between government offices. They indicate that public documents have an identical physical appearance, which is the folding book type (nuyulburi bicig), and follow a common writing format. To the contrary, judicial documents prepared and preserved by respective banners have never been highlighted in any studies to date. The author characterizes the judicial documents based on four observations: (i) Alasa Banner's judicial documents are unique and maintain a rigid style; (ii) during the Qing Dynasty, local government offices of the banners in Mongolia each prepared and preserved their own judicial documents presumed to vary in writing format and appearance by banner; (iii) judicial documents, with variations in style, are different from the official government documents, which are all identical in writing format and appearance; and (iv) judicial documents and public documents share some rules in writing, such as the use of particular expressions, outdenting (擡頭), changing lines before particular words (平出), and omitting letters (闕字).