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As an eco-friendly polymer, polylactide (PLA) can be produced from renewable resources such as corn and degrade into non-toxic carbon dioxide and water in natural environment.It shows a great potential as an environmentally-friendly alternative to traditional petroleum-based polymers for various applications.However, the practical applications of PLA as a general-purpose plastic or engineering plastic have been greatly hindered by its slow crystallization rate, poor heat resistance, and unfavorable barrier properties.Our previous work has demonstrated that N,N,N"-tricyclohexyl-1,3,5-benzene-tricarboxylamide, a highly effective nucleating agent (NA), can be dissolved in PLA melt and self-organizes into fibrils upon cooling to effectively tailor the crystal morphology of PLA.In this work, we will report our effort to impart PLA articles with excellent performance by using this fibrillar NA as a robust template.On one hand, based on the results that NA fibrils have a great tendency to align along the flow direction, high-performance PLA injection molded articles with well-oriented PLLA lamellae are successfully prepared.On the other hand, because the parallel alignment offers a good opportunity for PLA lamellae in one crystallite to penetrate into adjacent crystallites in the later stage of crystallization, forming a nano-brick wall structure at boundaries to disturb the gas diffusion, significantly improved oxygen barrier property of compression-molded PLA sheets is obtained via constructing parallel-aligned shish-kebab crystals with well-interlocked boundaries.Our work would provide a novel route to prepare high-performance PLA articles with the aid of NA.