Conflict resolution is one of key issues of traffic alert and collision avoidance system（ TCAS）. A path planning method for conflict resolution based on an improved ant colony algorithm is presented. The proposed method initializes ant colony optimization algorithm with the angle information to reduce blind search time. " Elite" strategy is also introduced which can provide additional pheromone enhanced during search procedure for the optimal solution. This scheme accelerates the algorithm searches with a suitable direction

which results in better planning path

shortens search time. The simulation results show that the proposed algorithm derives better path for conflict resolution with a higher efficiency

and has good prospects for development in air traffic collision avoidance system.