To study the properties of metal under extreme conditions, a parallel program for 3-dimensional dislocation dynamics (PDD3D) is developed based on JASMIN. By integrating effective distributed data structures, a scalable fast multi-pole method solver and a novel communication scheme based on ghost, PDD3D achieves good parallel scalability. In a simulation of a model containing 30 million dislocation segments, the parallel efficiency of PDD3D of 1024 CPUs relative to 128 CPUs is 81%.