短甬道矩形單室墓（或稱「凸形墓」）是東晉和南朝代表性的墓室形式。東晉以後，江南帝王陵墓和世家大族墓都採用凸形墓。雖然江南的東漢東吳大墓原來是複室墓，但是後來改變為凸形墓。這種変化的原因，目前普遍認為是晉朝南渡帶來的中原華北墓制的影響。
然而，從棺材和隨葬品的佈置等墓室內空間的設計和用法來看，凸形墓和中原華北墓制之間沒有直接的關係。加上，西晉晚期凸形墓在江南也已經開始主流化，早於晉朝南渡。東晉早期有些帝陵和貴族墓採用的是來自中原華北墓制的方形墓室，但是關於這些墓葬，木棺放置在和墓室主軸一樣的平行方向，是按照江南原有葬制的佈置形式。這種佈置形式跟中原華北墓制不同，因為中原華北墓葬木棺基本上是放置在和墓室主軸正交或相交的方向。所以在江南和中原華北之間，墓室空間的設計和使用的思想不同。東晉以來，江南方形單室墓和凸形墓都按著一個動線建築，木棺佈置和儀禮空間結合在墓室主軸方向一線上。總之，東晉南朝的凸形墓原來是江南當地墓制的小型和中型墓中所固有的，然後升級到大墓的墓室形式。
因此我認為，凸形墓主流化的現象意味著，西晉毀滅東吳以後西晉的喪葬制度滲透到江南社會。作為符合西晉喪葬制度體系的墓室形式，凸形墓在江南地區的多種墓室當中被選擇和標準化。

Eastern Jin and Southern Dynasties tombs typically consisted of a single rectangular chamber with a short dromos (also referred to as “tu”-shaped chamber tomb). From the Eastern Jin, this was adopted as the burial system in imperial mausoleums and tombs for noblemen in the Jiangnan region. Although large tombs in Jiangnan originally had been multiple chamber tombs, the “tu”-shaped single-chamber tomb became the norm. It is commonly accepted that background of this change is the impact of the single-chamber tomb in the burial system of North China, brought in with the Jin dynasty relocation to Jiangnan. However, when we think about this format of tomb chamber from the perspective of design and usage of space of a tomb chamber, such as placement of the coffin and grave goods, there is no direct relationship between the “tu”-shaped single-chamber tomb and the single-chamber tomb in burial systems of the Mainland and North China. Furthermore, in Jiangnan, mainstreaming of the “tu”-shaped single-chamber tomb had already appeared in the late Western Jin, that is, before the relocation of the Jin dynasty to the south. Also, in tombs of early Eastern Jin emperors and noblemen, coffins are placed in a direction parallel to the principal axis of the tomb chamber, in accordance with the local burial system of Jiangnan. Design and usage of space of that tomb chamber is different from burial systems of North China, where coffins were placed in a direction perpendicular to the principal axis of the tomb chamber. From the Eastern Jin dynasty, both the square single-chamber tomb and the “tu” shaped single-chamber tomb were oriented on a line of flow in which coffins and ceremonial space combine alongthe principal axis of the tomb chamber. In sum, the “tu”-shaped single-chamber tomb was the normal format for small and medium-sized tombs in the local burial system of Jiangnan, and it was then upgraded for use in large tombs. I think that the funeral system of West Jin infiltrated into the local society of Jiangnan after the Western Jin conquered the Wu. Thus, the “tu”-shaped single-chamber tomb was selected and standardized from local Jiangnan tomb formats for a tomb chamber that conformed with the funeral system of Western Jin.