Trajectory planning technology plays an extremely important role in the extrusion molding of composite fuse,and the reasonable trajectory can improve the surface quality and strength of the parts formed by additive manufacturing.According to characteristics of extrusion molding of composite fuse,a composite path filling algorithm was proposed by combining multiple path planning algorithms.NURBS curve was introduced to generate contour bias path,so as to maintain the precision of slice contour;the Zigzag filling path was generated in the inner area of the slice layer,and arc optimization was conducted at the path turning point,about 85% of the noncutting stroke was reduced and the forming efficiency was improved;a mathematical model of time analysis was built based on the generated path,so as to predict and analyze the total time required by the whole manufacturing process in advance,and to achieve the feedforward control of the manufacturing process;finally,the composite path filling algorithm was used to simulate and manufacture the typical structures,which reduced 28.3% to 36.2% of manufacturing time and improved manufacturing efficiency compared with the traditional algorithm.