EMP Simulators are important installations to implement HEMP effect and adaptability validation test for electronic equipments and systems. Horizontal dipole and headstand cone are two types of HEMP Simulator Antenna, which radiate horizontal and vertical polarization pulse electric field separatly. Radiation field distribution of arc horizontal dipoles with different bend radius and conic monopoles with different slope angle are simulated in this paper, and an optimized project of simulator antenna is investigated to improve test area peak field strength or uniformity.