Focusing on the complex shape and high contour accuracy of the gas turbine blade, a rapid investment casting method for gas turbine blade based on fused deposition modeling technology was proposed. The layered section generation algorithm based on non-uniform rational B-splines curve was used to slice the gas turbine blade STL(stereolithography) model to improve the contour accuracy of the blade model. The technological process of the rapid investment casting for gas turbine blade was formulated. The three-coordinate measuring machine was used to measure the casting of the gas turbine blade, and the profile deviation analysis and evaluation of its two key sections were carried out. The results show that the rapid investment casting blade castings based on the fused deposition modeling technology met the requirements in term of contour accuracy and the rapid investment casting technological process was reasonable and feasible.