3D mesh compression has been studies for compact storage and fast transmission of large 3D meshes for a variety of graphics applications. However, there is still much redundancy not well exploited by the previous works, e.g., the redundancy lying in the floating-point data texture coordinates. This paper investigates the statistical property of texture coordinates of a couple of 3D models and proposes a new entropy coding method to compress the floating-point texture coordinates of 3D mesh. It uses some reference buffers and proposes an updating scheme as well as a context based arithmetic coding algorithm. Experiments show that the proposed method can averagely reduce about 40% of bitrate compared with the state-of-art prior work.