To explore organic amine oxyanions with simple synthesis procedure and high energy， ethylenediamine diiodic acid and ethylenediamine hexamiodic acid were synthesized with iodic acid and ethylenediamine. The structures were characterized by single crystal X-ray diffraction， powder X-ray diffraction （PXRD） and Fourier transform infrared spectroscopy （FT-IR）. Differential scanning calorimetry（DSC）and thermogravimetric analyzer（TG）were used to study the thermal decomposition process. The power test of lead plate as main charge in 8^# industrial detonator and the burning test were carried out. The results show that two ethylenediamineIodate salts are successfully prepared. The ethylenediamine diiodic acid belongs to orthorhombic system， Pbca space group， cell parameters： a=7.4427 Å， b=6.7418 Å， c=18.2884 Å， Z=8， F（000）=760， D_c=2.982 g·cm^-3， and the peak temperature of thermal decomposition is 185.18 ℃. The ethylenediamine hexamiodate is a cocrystallization of ethylenediamine diiodate and iodate acid. It belongs to monoclinic system， P2₁/c space group， cell parameters： a=7.2350 Å， b=18.498 Å， c=7.5494Å， β=107.947°，Z=4， F（000）=996， D_c=3.840 g·cm^-3， and the peak temperature of thermal decomposition is 179.48 ℃ and 356.87 ℃. The 5 mm lead plate can not be made through when the ethylenediamine hexamiodic acid is used as main charge， while the opposite result occurs when mixed with 10% aluminum powder. The ethylenediamine diiodate can be used as a simple purple smoke agent.