Abstract: By using magnetostrictive characteristics of Tb0.3Dy0.7Fe1.95 to tune the time-delay line of linear chirped fiber grating (CFG), the ends of linear CFG are pasted firmly to the magnetostrictive rod with length of 70 mm and diameter of 8 mm. The center wavelength of the grating is 1 550 nm, the FWHM bandwidth is 15.48 nm and its length is 60 mm. The magnetostrictive rod is laid into a uniform magnetic field of coil. When the current in the solenoid changes from 0 A to 2 A, the grating gets a axial strain and the spectrum shifts about 1.6 nm to the longer wavelength, consequently, the maximum time-delay change, 60 ps, is achieved. The setup can make a four-elements optical-controlled phased array antenna with the element spacing of 0.006 m realize the scanning angles from 0°to 90°.