Abstract: Materials and molding technology of glass fiber reinforced plastic shell for large depth logging antenna were studied.Antenna cylinder developed could endure 0.35 MPa (50Psi) gas pressure without leakage after air-tight test. During downhole environment simulation test, the antenna cylinder has no damage, no leakage, insulation resistance between metal parts was more than 200 MΩ after the test was kept for 1 hour at temperature of 175℃, pressure of 140MPa (400Psi) and the cylinder filled with silicone oil. Antenna cylinder produced fully meet the requirements.