The study aims to provide information on the spray characteristics and vaporization process of ammonia-ethanol blends with a current GDI injector at different air densities and temperatures. The Schlieren technique was used to capture images of liquid spray. The penetration length and the spray angle at quarter-penetration length were measured and are clearly dependent on the ammonia ratio at low pressure, around 2 bar. A part of this study focuses on the vaporization process of the different blends with a comparison of the modeling of one single droplet vaporization. The calculation indicated a droplet temperature drop: from 9°C to -63°C from pure ethanol to pure ammonia, respectively.