The dispersion and nonlinear property of dispersion flattened photonic crystal fibers(PCF) with different structural parameters were numerically analyzed using beam propagation method. Dispersion coefficient D, effective mode area Aeff and nonlinear coefficient were calculated. The relationship between D, γand pitch Λ, hole diameter d was analyzed. The results indicate that dispersion and nonlinear property of dispersion flattened photonic crystal fiber can be controlled by the structural parameters Λ,d. In the range from 1300 nm to 1600 nm, PCF’s dispersion achives about -1.5 ps?kmˉ1?nmˉ1, and non-linear cofficient is above 19 Wˉ1?kmˉ1.