YbZn2As2 (YZA) belong to ternary rare-earth based compounds with CaAl2Si2 type of structure. Early the crystal structure of YZA was determined by X-ray powder diffraction (XRPD) [1]. In this report we present X-ray single-crystal structural study, magnetic, and electrical properties of this compound. YZA crystals were synthesized by direct reaction of the constituting elements in corundum crucibles sealed in evacuated quartz tubes. Reaction temperatures were 1050ºC. The crystal stoichiometry was proved by energy-dispersive X-ray analysis. X-ray single-crystal data were used for more reliable determination of the crystal structure. The temperature dependence of electrical resistivity was measured by the 4-probe dc technique in the temperature range 4.2 - 290 K. The magnetic susceptibility was measured using a commercial SQUID magnetometer. Single crystal data of YZA were obtained at room temperature using an Xcalibur E diffractometer supplied with an EOS CCD space detector and a monochromatic source of MoKα radiation (graphite monochromator). The structure was refined by the full matrix least squares method on F2 with anisotropic displacement parameters. The final R indices (all data) were: R1 = 0.0180, wR2 = 0.0506. Structure investigation of YZA confirmed previously [1] powder diffraction data. The crystals belong to trigonal P-3m1 space group, a=b=4.16340(10), c=6.9688(2) Atoms Atomic coordinates ( x 104) Equivalent isotropic displacement x y z parameters (Å2x103) Yb 0 0 0 10(1) Zn 3333 6667 3683(2) 11(1) As 3333 6667 7429(1) 8(1) The temperature dependence of the resistivity shows a metallic character in interval 4.2-300 K with the p-type conductivity at all temperatures. At room temperature electrical resistivity is 0.15Ωcm, and R290/R4.2 ratio is 2. The magnetic susceptibility of YZA in temperature interval 2-500 K follows the Curie-Weiss law with negative paramagnetic Curie temperature. The small deviation from Curie-Weiss law below 20K was observed. The negative paramagnetic Curie temperature is evidence of antiferromagnetic interaction of Yb ions. The effective magnetic moment μeff is equal to μeff=2.35 μB (the Bohr magneton) per Yb ions. A well pronounced anomaly observed in the temperature dependence of the specific heat at 0.58K. Transition to the antiferromagnetic state is more reasonable case of the observed anomaly. With increasing magnetic field the transition temperature is shifted to lower temperatures (0.55K at 5T). The C/T value at 2.5K is 32 mJ/molK2.