To provide a survivability evaluation method of geotextile coinciding with field information as well as high reproductivity as a soft subgrade/base course separation sheet with CBR less than 3 and prescribed by JIS A 1211.

Laminated body or mixture including at least one kind selected from a group of sand, soil, clay and rubbery substance or at least one kind selected from a group of sand, soil, clay and rubbery substance is provided to one side of a geotextile 4. The laminated body including at least one kind selected from a group of crushed stone, sand, soil and clay or at least one kind selected from sand, soil and clay is provided to the other side of the geotextile, and damage is evaluated by applying repeated load of 5-2,000 kPa with a loading plate.