With abilities of overview observation and direct interaction, interactive tabletop is one of the most attractive research fields of human-computer interaction. Apart from finger tracking and pen input recognition, tangible object (usually substituted by tangible token) should be recognized to fulfill the information interaction between objects and tabletop. However, the large-scale tabletop (above 100 inch), which is usually tiled by several tabletops, brings enormous challenge to tangible marker tracking. This paper presents the design of tangible marker-uMarker and recognition system-uMatch for uTable, a prototyping tabletop system of Tsinghua University with size of 3800mmX2010mm. With infrared diffusion, uTable has its special working conditions- minimum recognition distance, accuracy and area of blind zone. We designs uMarker a 35mmX25mm ordinary paper with 3X3 matrixes two-dimensions encoding pattern which can establish 155 markers and angle range from 0 to 360°with the accuracy of -8̃8°, which possesses the feature of small size with large encoding information considering the pattern and encoding designation. Besides, uMatch is combined into the vision recognition of uTable, which can track uMarker with the performance that 4 uMarkers can be recognized in the same camera image with processing speed of 50Hz and the accuracy of 100%. uMarker (position, angle and ID) extends the interaction on uTable for tangible interaction.