A hetpa-band antenna design for the mobile phone of metal casing has been proposed. The antenna can operate at 800~960 MHz, 1 710~3 000 MHz, for 2G, 3G, and LTE bands. To guarantee the performance of the antenna, Ushaped slot is etched on the metal casing. By taking a feed matching capacitor and a switch circuit, the proposed antenna is capable of covering GSM850/900 (824~960 MHz), DCS/PCS/UMTS2100(1 710~2 170 MHz), LTE2300/2500(2 300~2 700 MHz), hetpaband. The outside dimension of the phone is 152 mm (length)×72 mm(width)×6.8 mm (height), a 7 m×67 mm area is excised at the top edge of the system board. The antenna prototype is fabricated and measured, and it has good radiation performance. For the 824~960 MHz, the radiation efficiency from 38% to 46%. For 1 710~2 700 MHz, the radiation efficiency is from 38% to 64%. It is appropriate for the application of mobile phone with metal casing.