Duplicated geotextiles to improve the weatherability were made of recycled polyester (PET) geotextile with carbon black as ultraviolet stabilizer and polypropylene (PP) geotextile by needle-punching method. Their physical properties, ultraviolet resistance, and chemical stability of duplicated geotextiles were evaluated. Retention ratio of tensile properties of nonwoven polypropylene geotextiles decreased by about 50% on exposure to ultraviolet light, but those of geotextile composites were slightly decreased compared with polypropylene geotextiles. Duplicated geotextiles which have larger weights of polyester geotextile were more stable against ultraviolet light. The changes of tensile properties of geotextile composites were in the range of -20∼+10% under the various chemical conditions.