The sensor-fault detection for linear system with bounded unknown input disturbance was studied. By non-singular linear transformation,the sensor-faults were converted equivalently into actuator failures.The residual generation was proposed which is robust to disturbance and sensitive to sensor faults. A sliding mode observer was further designed to give the estimation of residuals. The sensor faults can be detected and the sensor signals can be reconstructed by using the estimation of residuals. For typica...