A two-lane cellular automaton model was developed to analyze traffic flow considering influence of emergency vehicle. The affected areas of emergency vehicle and the give way probability of general vehicles was introduced to modify lane change rules. Space-time diagram of different densities and fundamental diagrams under different parametric conditions were given by numerical simulations. The simulation results indicate that the parameter settings for affected areas of emergency vehicle only improves traffic volume with density in the range of 0.08 to 0.18 but it makes the emergency vehicle speed increase significantly in larger density. And the give way probability has an important impact on lane change times with density greater than 0.8. The study found that appearance of emergency vehicles promoted traffic flow of lower density more balanced and the interference on traffic flow of higher density was limited.