The grain growth characteristics of dual-phase (${alpha}+{gamma}$) containing high Cr-steel have investigate using ${alpha}$-, ${gamma}$-single phases and (${alpha}+{gamma}$)dual-phase of 12%Cr Steel. The heat treatment has performed at $1000-1200^{circ}C$ for 1-100hr. The results are as follows : 1) The grain growth rate in (${alpha}+{gamma}$) dual phase was substantially slower than that of single grain. 2) The relation between mean grain radius $ar{{gamma}}$ and annealing time t is, in general, described as following equation : $$(ar{{gamma}})^n-(ar{{gamma}_o})^n=K_n{cdot}t{cdots}{cdots}(1)$$ i) In the case of single phase of high Cr steel, Eq.(1) is described as $(ar{{gamma}})^2-(ar{{gamma}_o})^2=K_2{cdot}t$ and the grain growth is controlled by boundary migration. ii) In dual phase, the grain growth needs diffusion of alloying elements because the chemical composition of ${alpha}$- and ${gamma}$- phases differs from each other. When the volume fraction of ${alpha}$-, ${gamma}$-phase was almost equal and ${gamma}$-phase in the case of 80 and $90%{gamma}$. Eq.(1) is described as $(ar{{gamma}})^3-(ar{{gamma}_o})^3=K_3{cdot}t$ because the grain growth is controlled by volume diffusion iii) In the case of ${gamma}$-rich phase (80 and $90%{gamma}$), the grain growth of minor phase (10 and $20%{alpha}$) is described as $(ar{{gamma}})^4-(ar{{gamma}_o})^4=K_4{cdot}t$ because the boundary diffusion is predominent rather than volume diffusion.