Effect of rapidly solidfid 6.5wt%Si-Fe alloy annealed in the sulfur atmosphere were studied. The ribbons Which were showed with random structure at the received state, were developed into(110) texture in the heat treatment of the vacuum atmosphere, into (100)texture in the sulfur atmosphere. After the ribbon was continuously annealed in the vacuum atmosphere for 3 min. at $1100^{circ}C$, and sulfur atmosphere for 1hr at $1175^{circ}C$, grain size of (100)plane was grew to 4-8mm and the coercive force was decreased to 2-4A/m remarkably.