A 3-D real-time deviation method in terminal airspace is presented based on the multipleMorphin planning algorithm. Firstly, a set of arcs is generated with various changes of heading, and angles of climb/descent in accordance with present attitude. Then each end of the arcs is carried out such operation to regenerate candidate deviation routes. Finally, the optimal route is selected with comprehensive assessments. The example proves the reliability and the efficiency of the method in providing safe and efficient deviation, and the improvement of the usage of hazardous-weathereffected terminal airspace.