Abstract
In order to reproduce Si isotopic ratios in presolar grains from supernovae, we investigate Si isotopic ratios in the mixtures of supernova ejecta. We calculate detailed nucleosynthesis of the supernova explosions using He star models. When we consider the mixing of Ni, Si/S, He/C, and He/N-layers, Si isotopic ratios of the mixtures of 3.3 M supernova model and 8 M hypernova model well reproduce those of presolar grains from supernovae.