Four types of nonwoven geotextiles were used to examine the applicability for the coastal engineering field and tensile properties were reviewed in 10% NaCl solution as a simulated sea water. The immersion conditions were 96, 192, 500 hours at 35, 45, 55, 65, 75, $85^{circ}C$ respectively. For the case of 10% NaCl solution immersion for 96 and 192 hours, nonwoven geotextiles showed little decrease in tensile strain although the temperature increased. However, as immersing time was expanded to 500 hours, the tensile strain decreased seriously as the temperature increased. Tensile strain and strength of geotextiles decreased by increasing temperature and NaCl solution resistance of nonwoven geotextiles is significantly dependent on temperatures such as higher the temperature, lower the NaCl solution resistance.