Aiming at the low accuracy and heat conductivity of the existing epoxy-type rapid tooling method，a metal-type rapid tooling method based on the low-melting-point alloy is put forward for wax-injection pattern of investment casted turbine blades. The composite structure of the wax-injection cavity mold is designed, outside of which is a aluminum frame, and inside of which is the casted low-melting-point alloy with an embedded conformal-cooling copper-tube. Moreover, the conformal-cooling pipes in the mold are designed, and the cooling temperature field of the mold is simulated using the ANSYS software, regarding the system of ″mold, wax-pattern and core″ as the analysis object. The simulation result shows that the cooling rate and the temperature uniformity of the mold are greatly improved.