The seismic moments (M_o), body-wave magnitudes (m_b), and surfacewave magnitudes (M_s) of 201 Taiwan earthquakes with 4.8 ≤ m_b ≤ 6.6 published in the Global CMT catalog from 1976 to 2006 are used to study the correlations among the three source parameters. The resultant relationships are: log(M_o) = (1.07 ± 0.04) M_s + (18.72 ± 0.20); log(M_o) = (1.73 ± 0.09) mb + (15.09 ± 0.52); and M_s = (1.46 ± 0.08) mb - (2.52  ±0.43). The three relationships have high agreement with those of earthquakes in the circum-Pacific seismic belt. This might imply that the tectonic conditions and source properties of the Taiwan region behave like the average ones of the circum-Pacific seismic belt. The relationships between the three source parameters and local magnitude are: log(M_o) = (1.27 ± 0.06) M_L + (17.23 ± 0.35); m_b = (0.66 ± 0.03) M_L + (1.69 ± 0.17); and M_s = (1.03 ± 0.06) M_L - (0.53 ± 0.36).