Abstract: Hongkongochelys yehi, a new fossil turtle，is described in this paper. The specimen was collected from the Upper Jurassic of NeiJiang, Sichuan, China, and is housed in Zigong Dnosaur Museum（zDM0102）· ZDMO 102 is a relatively complete specimen. Its main features can be summarized as the follows: carapace oval and slightly convex; vertebral scutes relatively broad; nuchal plate broad and large; the seventh and eighth neural plates reduced, and the seventh and eighth costal plates meeting their mates along mid—line; suprapygal absent; plastron slightly reduced, with a short, broad anterior lobe, and a long, narrow posterior one; median plastral fenestra and lateral plastral fenestra developed; a small posterior plastral fenstra present between hypoplastron and xiphiplastron; inframarginal scutes absent; plastron loosely connected to the carapace. In view of the above features, the new genus may be included in Sinemydidae (see table 2 for detailed comparisons with Sinemys and Manchurochelys). Before the present paper, all the Jurassic turtles known in Sichuan are included in two groups: Chengyuchelyidae and Plesiochelyidae. The new discovery from Neijiang is the first record of Sinemydidae in Sichuan. It not only expands the geographical distribution of Sinemydidae, but also increases our knowledge about Sinemydidae: Sinemydidae and Macrobaenidae are closely related, but the inframarginals are absent in the foremer and present in the latter.