To evaluate the heterosis of rice starch viscosity properties, 30 hybrid combinations were obtained from incomplete diallel cross between six sterile lines and five restorer lines of indica hybrid rice cultivars. The rapid visco analyzer (RAV) profile parameters of starch viscosity in hybrid combinations and parents were measured and statistically analyzed. Results showed that there were highly significant differences for the RVA profile parameters in both the hybrid rice combinations and their parents, among those parameters setback had the widest range of variations but the pasting temperature had the narrowest range of variations. The coefficients of variation of the starch RVA profile parameters of hybrids were smaller than that of the parents. The average of peak viscosity, trough viscosity, breakdown, final viscosity, peak time and pasting temperature of all the hybrid combinations were larger than that of the parents. However setback and consistency were smaller than that of the patents. Highly significant heterosis over high-parent was found in peak viscosity, and highly significant heterosis over mid-patent were found for trough viscosity, breakdown, final viscosity and consistency. Highly significant negative heterosis over mid-parent and positive heterosis over low-parent were found in both setback and peak time. Highly significant negative heterosis over low-parent was also found at pasting temperature. There were highly significant positive correlations between the hybrid rice combinations and the female parent and mid-parent value on peak viscosity, breakdown, setback and consistency. Significant positive correlations were also found between the hybrid rice combinations and mid-parent value on peak time. While there correlations to the male parent did not reach a significant level. Our data suggests that the starch viscosity properties in hybrid rice combinations were largely affected by the female parent compared to the male parent except for trough viscosity and peak time.