The control of the temperature field during single crystal solidification has an important effect on single crystal growth. The present paper studied the influence of ceramic shell mold with central heat radiation on the microstructures and stress rupture property of the widely used DD6 single crystal superalloy. The results indicated that the mold with graphite center pillar could improve the uniformity of the temperature field and the temperature gradient during the solidification, and it could make the direction of heat flow more straight. As a result, the primary dendrite arm spacing decreased, the size and the volume fraction of γ-γ'' eutectic were reduced, the angle between the single crystal growth orientation and the [001] orientation decreased, so the single crystal superalloy can achieve longer stress rupture life.