Abstract: Zr-Si pentasil type molecular sieve was synthesized with tetraethyl orthosilicate or water glass as the silica source and zirconium oxychloride as the zirconium source, and tetrapropylammonium hydroxide (TPAOH), 1, 6-hexandiamine (HDA), tetracthylammonium hydroxide (TEAOH) or tetrabutylammonium bromide (TBABr) as the templating agent. The structure of the molecular sieve has been studied by means of X-ray diffraction, X-ray electron probe and IR. The parameters of unit cell of Zr-Si pentasil type molecular sieve were obtained by step scanning procedure with step size of 0.01°(2θ) on X-ray diffractometer. The results indicate that Zr is introduced into framework. The ability of adsorption, thermal stability, specific surface and acidity for the molecular sieve were also studied.