The petrological characteristics of Sangpiyu tremolite jade from Xiuyan County of Liaoning Province were studied using polarizing microscope and electron probe microanalysis (EPMA). The zircon and titanite grains which are separated from Sangpiyu tremolite jade were dated by secondary ion mass spectrometry (SIMS). The results show that Sangpiyu tremolite jade is mainly composed of tremolite, and its secondary minerals mainly include apatite, calcite, chlorite, graphite, limonite, zircon and titanite. Under polarized light microscope, the main textures of Sangpiyu tremolite jade are felt-like fiber interweaving texture, micro-fine crystalline texture and fibrous metamorphic texture. The main structure is massive structure. The main chemical components of Sangpiyu tremolite jade are SiO₂, MgO and CaO. The ratio of Mg²⁺/(Mg²⁺+Fe²⁺) ranges from 0.964 to 0.971. The zircon ²⁰⁶Pb/²³⁸U age of Sangpiyu tremolite jade is 1 851±7 Ma, and the titanite²⁰⁷Pb/²⁰⁶Pb age is 1 848±17 Ma. The Sangpiyu tremolite jade was formed in the dolomite during the period of palao-Proterozoic regional metamorphism.