Abstract: Seven resin materials with decreasing elastic moduli were selected.Tensile specimens with four interface structures were prepared by multi-material jet printing of two materials with the smallest and the largest elastic moduli; the two materials were connected parallelly.The interface structures were listed as follows:without transition layer, with homogeneous transition layer (composed of one material with mediate elastic modulus), and with 3 mm and 5 mm thick graded transition layers (composed of other five materials).The interface forming quality and tensile properties were analyzed.The results show the specimen without transition layer had grooves and much holes at interfaces, indicating a poor forming quality.With a homogeneous transition layer, the defects at the interface decreased in amounts, the tensile strength increased slightly, but the fracture strain decreased by 14.8%.With graded transition layers, the interface forming quality further increased, the tensile strength increased slightly and the ductility increased obviously.Comparing with that without transition layers, the fracture strains of specimens with 3 mm and 5 mm thick graded transition layers increased by 10.6%, 37.9%, respectively.