Tokamak nuclear fusion device depends on superconductor magnet and its stability to keep the device steady.Nowadays

CICC is the first selected conductor for large cryogenic superconductor magnet;it is necessary to study the cryogenic operation stability of CICC under high current and in rapidly changing magnetic field.Aiming at the stability mechanism of CICC and after giving the experical design formula of some material

the paper gives calculation of sharing current temperature

temperature margin and energy margin

and draws simulation curve.Then

the result is saved into database.Finally

after compared the designed value with the result of simulation

almost the same conclusions are found.The research offers help to the design of CICC in the future.