Improved Measurement of Ab using Jet-charge Technique at SLD ------------------------------------------------------------ We present an improved SLD measurement of the parity-violating parameter Ab from Left-Right Forward-Backward asymmetry of b b-bar pair production at the Z0 pole. We take advantage of the high polarization of the SLC electron beam and use a jet-charge self-calibrating technique. A high purity b-tag based on topological reconstruction of the mass of B-decay vertex is used in the measurement.