Dielectric properties of shrimp (Penaeus sp.) were measured at frequencies between 300 to 3, 000MHz from 0 to 70°C by using a network analyzer. The effects of frequency, temperature and sample orientation on dielectric properties were discussed. At all temperatures, the dielectric constant decreased as frequency increased from 300MHz to 3, 000MHz. The dielectric loss factor decreased with increasing frequency blow about 2, 000MHz, and then reached approximately constant or increased a little. For commercial significance, dielectric properties data at 915 and 2, 450MHz were considered in more detail. The results suggested a linear relationship between the dielectric constant and temperatures, and a quadaratic relationship between the dielectric loss factor and temperatures. The relationships between the penetration depth and temperature at both frequencies were evaluated from the experimental data.