In this thesis, the synthetic hectorite was introduced to improve the material of Lonquan celadon. The effects of different amounts of hectorite on important characteristics of Longquan celadon were compared. And such important characteristics include rheological properties of clay, microstructure and mechanical properties after sintering. Besides, the 3D printing standard model test of the modified clay was carried out by using mould-free forming technology, so as to test its pendulous performance. The results showed that the addition of hectorite can obviously improve the clay plasticity and effectively reduce deformation and cracking caused by poor plasticity. The flexural strength of the casing went up first and then down, while the water absorption rate went down first and then up. When the addition amount of hectorite was 1.5-2%, the flexural strength of the sample was the best. At this point, the perfect pendulous standard model could be successfully printed.