Last years, the rapidly growing field three-dimensional topological Dirac semimetals have attracted a considerable interest. Recently was established that well known compound Cd3As2 is a symmetry-protected 3D Dirac semimetal with a single pair of Dirac points in the bulk. Doping Dirac materials magnetic impurities can give rise to interesting properties of these materials. However, despite a long history of studying Cd3As2 investigation of the properties of 4f elements doped Cd3As2 has not been performed. In this report we present the results of the first study magnetic susceptibility and electron spin resonance (ESR) in Cd3As2 doped by europium. Сrystals of Cd3As2:Eu were grown out of a Cd2,95Eu0.05As2 melt. The stoichiometry amounts of elements Cd, As and Eu were sealed in an evacuated quartz ampoule, heated to 8000C, and kept there for 48 hours. The melt was then cooled at a rate of 5 degrees per hour to 4000C. Chemical analysis of the crystals was performed by x-ray analysis (EDX), which found them to have a nearly stoichiometry composition with a slight excess of cadmium and arsenic deficiency. Powder X-ray diffraction (PXRD) to confirm the identity of the compound as being Cd3As2 in the low temperature () modification with tetragonal lattice parameters a =12.654(5), c =25.465(3). Electrical properties were characterized by standard four probe method in temperature interval 12-300 K and magnetic field 0.5 T. Resistivity and Hall measurements provide an electron density of ne = 2.2 × 1019 cm−3 (roughly independent of temperature), a metallic resistivity, and a mobility of μ = 6 × 103 cm2/Vs at 12 K. The ratio of resistivity 300K/ 12K =18. The magnetic properties were measured in the temperature range 2-400 K using a commercial SQUID magnetometer up to magnetic fields of 5 T. At high temperatures, the magnetic susceptibility is negative, with the transition to positive values at temperatures below 100 K. At temperatures below 30 K begins a transition to a presumably ferromagnetic ordered state. In experiments on microwave absorption we have measured X-band ESR and the field dependence of the microwave surface impedance (MSI) in pure and europium doped samples. Measurements was carried out in a temperature range of 10-350 K and magnetic fields 0 - 1 T. Strengthening of the MSI field dependence was observed at lowering of temperatures. For pure Cd3As2 on the background of a strong dependence of the MSI on magnetic field in the temperature range 100 - 200 K, appears weak ESR signal with a g factor ~ 2.15 and a linewidth ~ 200 Oe. For europium doped samples above room temperature, we observed two symmetric ESR signals with linewidth of about 150 Oe with g1 = 2.28 and g2 = 3.9. Below 300 K, a strong distortion takes place and displacement of resonance lines to lower fields. At decreasing the temperature to 10 K, conditions of ESR observation becomes much worse due to strong broadening and disappearance of resonant signals. Usually such behavior testifies about ordering of magnetic impurities. The experimental results are discussed in terms of the interaction of magnetic impurities in semimetals with Dirac fermions [1,2].