Abstract: CB/TPU composite powders obtained by mechanical mixing were sintered by selective laser sintering, and flexible conductive composites were prepared. The influence of different CB/TPU mass ratios on the electrical conductivity, piezoresistive property, hysteresis property, relaxivity property and reproducibility of the materials were investigated. The results showed that the CB can significantly improve the conductivity of the composite. The electrical conductivity of composites varied from 7.69×10^-4 to 2.5×10^-1S/m, depending on the mass ratio of CB/TPU. The percolation threshold of the CB filled TPU is about 2.9 wt%. The piezoresistive tests showed that the reciprocal of the resistance was proportional to the pressure, and the slope of the 1/R-F curve increased as the mass ratio of CB/TPU increased. With the increase of CB/TPU mass ratio, the hysteresis property of the composites was weakened, whereas the relaxivity property was enhanced. After 1000 loading-unloading cyclic tests at 20 N, remarkable piezoresistive property remained, However, the resistance decreased, and the magnitude of the decrease enlarged as the mass ratio of CB/TPU increased.