Abstract: The collision phenomenon of numerous droplets exists in two mutual impingement sprays. A binary-droplet collision model was established to simulate the shape of sprays, in order to make up the widely used O’Rourke model. The criteria relations were founded to distinguish the regimes of coalescence, bounce, stretching separation and reflexive separation of binary-droplet collision occurring in sprays. The calculation equations were derived to obtain the number, size and velocity of newly generated droplets after collision under each regime. This new binary-droplet collision model established in this paper was used to simulate the shape of two mutual-impingement sprays and compared with experimental data. The simulation outcomes show that the general shape of sprays simulated by the new model is in agreement with experimental data. The shape of spray collision zone can not be reflected by O’Rourke correctly. Instead, this zone obtained by new model is in accord with experimental data. Furthermore, nearly none of droplets are generated in the outside of sprays by new model, which is as same as that in experimental photograph. However, some droplets are obtained in this outside zone by O’Rourke model. The result shows that comparing with O’Rourke model, the new binary-droplet collision model can simulate the shape of sprays correctly. This new model is able to simulate the spray shapes more reality, which supplies a reliable droplet collision model to study the characteristics of sprays in a quantitative way.