Abstract: Shoushan stone is one of four traditional seal stones in China, which is an epithermal nonmetallic deposit, but the age of its mineralization is unclear. In this paper, the alunite ⁴⁰Ar/³⁹Ar age of Gaoshan Shoushan stone deposite is determined by using the micro area laser heating technology. The plateau age of alunite is 122.56 ± 0.95 Ma, and the corresponding ⁴⁰Ar/³⁶Ar-³⁹Ar/³⁶Ar isochron age is 122.55 ± 0.95 Ma. The recorded time of alunite in Gaoshan mining area represents the ore-forming age of high-quality filling-type dickie of shoushan stone, and it represents that the latest metallogenic age of Shoushan stone is about 122 Ma. In combination with the age (132-135 Ma) of the volcanic rock, from Xiaoxi formation, which is the parent rock of Shoushan stone, it indicates that the metallogenic age of Shoushan stone should be 132-122 Ma.