Woven authentication pattern in textile is an important method for identification, which commonly include fibers with different colors, such as security labels. However, the colored fiber is not a promising solution for authentication patterns as it would affect the appearance of the textiles and the visible pattern is less secure. Meanwhile, the limited choice of fluorescent limits the particularity of the constituent fibers and the authentication function is deeply dependent on the interweaving technique, which may be easily forged. Here, we demonstrate a new approach towards textile authentication by introducing fibers with predesigned functional structures. The emission of the fibers in the infrared region has been effectively modified by these structures, which can be directly observed under a thermal camera, while the formed pattern cannot be seen in the visible region. Textiles with thermal identification are thus achieved by the combination of functional pattern and interweaving technique.