The in-vacuum undulator(IVU-25) with hybrid magnet structure in SSRF(Shanghai Synchrotron Radiation Facility) is the first one developed in China.Major parameters of IVU-25 are:minimum operation gap

7 mm;peak field

0.94 T;period length

25 mm;period number

80

and total length

2 m.The field integral errors

caused by unavoidable remanence divergence of the magnets

position errors of magnets and poles

etc.

would badly affect the beam orbit in the storage ring

hence the need of corrections of the integrated multipoles using the magic fingers technique.In this paper

we present the integrated multipoles correction methods by reducing the normal and skew first field integral errors based on the simulated-annealing algorithm.The results show that the final values of the integrated multipoles are all better than the required ones.