In Copia Nature Reserve (Thuan Chau district. Son La province), sixty two species of land snails were collected and defined from May 2009 to March 2013. They belong to 41 genera, 16 families, 3 orders of 2 subclasses Pulmonata and Prosobranchia. The prevalence of Pulmonata snails are 74.19 percent (46 species), while Prosobranchia snails are 25.81 percent (16 species). Ariophantidae has the highest diversity with 12 species, Cyclophoridae and Subulinidae has 10 species, and Camaenidae has 8 species. Other families have 1 to 3 species.