MgSiO_3 was synthesized by homogenous precipitation method with Na_2SiO_3 as a precipitating reagent and MgCl_2 or MgSO_4 as the magnesium source,and the protoentatite and clinoenstatite were gained after heating treatment at 1200 and 1000℃,respectively.The analysis of Raman and infrared spectra has revealed that there are two bridging-oxygen atoms binding to each Si atom within SiO_4 tetrahedrons for the prepared MgSiO_3,in which the tetrahedra occurs likely in chains.