We have made enriched 12 C targets to accurately measure the cross-section of the 12 C(α,γ) 16 O reaction, which is very important in nuclear astrophysics. Isotopically enriched 12 C targets for studying this small cross-section, especially for use with an intense pulsed α beam was desired to meet the following requirements: (1) use of impurity-free enriched 12 C, (2) stability for a long time measurement and (3) uniform thickness in the range 200–300μg/cm 2 . To meet these experimental requirements, isotopically enriched amorphous 12 C powder was converted into graphite powder in an electric furnace at a temperature of 3000K and subsequently the graphite powder was deposited on a thick Au backing via the HIVIPP method. Targets thus prepared could be made thicker than 200μg/cm 2 . They had a good uniformity and a very high stability against irradiation with high intensity ion beams.