The wollastonite (CaSiO3 ) synthesized by high temperature (HT) under atmospheric pressure (AP) has a triclinic structure while the natural wollastonite with high purity originating from Dading Mountain, Lishu, Jilin Province, China, has a white chain-like structure of monoclinic type. Pressure-induced phase transformation of this natural wollastonite above and the wollastonite synthesized directly from raw materials by HP and HT were firstly investigated. Results show that the natural wollastonite treated under HP (4.6~5.0 GPa) and HT (1 200~1 250 ℃) transforms to partially translucent cubic crystal with dark rose colour and the one synthesized directly by HP (3.8~4.3 GPa) and HT ( 1 050~1 100 ℃)to the same structure and with similar appearance. SEM analysis indicates that, for the natural wollastonite, the contents of SiO2 and CaO are 50.8% and 48.1% respectively, while the synthetic one, both treated and synthesized directly by HP and HT, has the contents 51.35% and 48.15% respectively.