With the wind turbine generator proposes higher individual capacity and greater power density,the HTS generator shows a wide application prospect in the future in the field of offshore wind turbine,airborne vehicles generator and ship generator.For researching the foundation problems of the key technologies on HTS generator magnet topology,racetrack gas-liquid two-phase cooled YBCO magnet and cryogenic systems.A gas-liquid two-phase cooled YBCO magnet system is developing at IEE.The rotor consists of an iron core and racetrack coils wound with the spliced YBCO-coated conductors with the total conductor length of 6 km.