The permeability of shell molds is a key property for investment casting technologies because it affects casting defects like non-fill and de-wax cracking. Currently, the permeability measurement method for investment casting shell molds is not specified in Japanese Industrial Standard (JIS). Permeability is presently measured by two common methods : Ping pong ball method and Pipe method. Because the mold cracks during the preparation of shell mold samples, there is room for improving these methods.  In JIS, permeability measurement for ceramics materials is specified in JIS R 2115 (2008). Thus, in this study, we investigated a method to prepare shell mold samples and a method to measure investment casting shell molds based on JIS R 2115 (2008). Moreover, the influence of stucco size and firing temperature on the permeability value were reviewed. The results showed that the permeability value is affected by the sintering extent and crack number or its size.