The elastic, optical and effective mass properties of CrSb in Zinc Blende (ZB) phase were investigated. The calculations were carried out using the full potential linearized augmented plane wave plus local orbital according to the Density Functional Theory (DFT). The results of elastic calculations by GGA and LDA approximations indicate that ZB CrSb is a ductile material and its Debye temperature is rather low. Band structure and DOS calculations introduce the ZB CrSb as a half-metal with spin polarization of 100%. In metal state 16th and 17th bands cut off the Fermi level. Calculations study the effective mass, Fermi velocity and Fermi surface at 16th and 17th Bands. In continue, optical quantities such as dielectric function, energy loss function and optical conductivity have been investigated.

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