In order to avoid cross-sensitive connection of temperature and strain in fiber grating sensing system, one dual-parameter sensor employing fiber Bragg grating (FBG) is investigated. Based on theories of temperature and strain testing using FBG, the operating principle of the dual-parameter sensor is described. The experiment on the dual-parameter sensor is performed for linearity and sensitivity of temperature and strain, and measurement results combined effects of strain and temperature loading are described. Dynamic range and sensitivity of temperature FBG are about 0 ℃～100 ℃ and 12.2 pm/℃, for strain FBG about 1.79 pm/N. The experimental results show that this method can eliminate availably cross-sensitivity of temperature and strain for strain FBG sensor, and measure temperature and strain accurately and synchronously.