Electroweak measurements with heavy quarks at SLD

The SLD detector collects data at the Z(0) resonance using e(+)e(-) collidi ng beams of SLC. Polarized electron beams and small SLC interaction region together with the unique CCD vertex detector provide an outstanding opportu nity for precision electroweak test of the standard model, especially in th e heavy quark sector. Improved measurements of heavy quark electroweak para meters, including A(b), A(c), R-b, and R-c are presented. Measurements are based on approximately 400k hadronic Z(0) events, including data from the m ost recent 1997-98 SLC run.