In this study, the sintering behavior of (Nd, Dy)-Fe-B powder which fabricated by strip-casting was investigated with various sintering temperatures and holding times. The relative density over 99% could be obtained by both sintering at $1070^{circ}C$ for 1h and sintering at $970^{circ}C$ for 20h. The grain growth was observed in sintered specimen at $1050^{circ}C$ compared to one at $970^{circ}C$. The isothermal sintering process below $1000^{circ}C$ led to suppress grain growth showing the improved magnetic properties. The phase transformation of Nd-rich was confirmed by X-ray diffraction pattern.