[en] A parallel plate fracture model is used for the safety assessment of radioactive waste disposal in crystalline rocks, such as granitic rocks. The parallel plate model was also applied in the second progress report for the research and development of radio active waste disposal program in Japan, called H12 report. However, it is known that an effect of heterogeneously distributing fracture aperture onto the hydraulic property is different from the transport property used for the parallel plate model, because actual fractures show fully complex structure and fracture aperture is heterogeneously distributed. Therefore, we have examined to measure aperture distribution and tracer concentration distribution data by optical method for transparent replica made from artificial fracture by casting method in order to investigate influences of heterogeneity of aperture distribution to the hydraulic and mass transport properties used for parallel plate model and to understand the relationship between fracture transmissivity and transport aperture. The numerical simulation based on darcy flow and heterogeneous transmissivity field estimated from the measured aperture under the assumption local cubic law, shows 1.6 times larger flow rate than the data obtained from the hydraulic test. This result is one of precious evidence supported by quantitatively measured aperture data to demonstrate the inconsistency of the assumption of 'local cubic law'. (author)