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As is known to all, environmental barrier coating requires high bonding strength and low thermal conductivity to extend the service life of ceramic matrix composite (CMC) components. In this work, a novel nanostructured Lu 2 Si 2 O 7 /Lu 2 SiO 5 environmental barrier coating was deposited successfully using as-synthetized Lu 2 Si 2 O 7 feedstocks and Lu 2 SiO 5 feedstocks. Meanwhile, the microstructure, bonding strength and thermal conductivity of Lu 2 Si 2 O 7 /Lu 2 SiO 5 coating were analysed systematically. Results indicate that the nanostructured Lu 2 Si 2 O 7 /Lu 2 SiO 5 environmental barrier coating processes a bi-model microstructure. The Lu 2 Si 2 O 7 /Lu 2 SiO 5 coating is relatively dense and the Lu 2 Si 2 O 7 layer and Lu 2 SiO 5 layer achieve the mechanical interlocking. The bonding strength of Lu 2 Si 2 O 7 /Lu 2 SiO 5 coating is 14.9 MPa. In addition, the thermal conductivity of Lu 2 Si 2 O 7 /Lu 2 SiO 5 coating is 0.59 W·m−1·K−1–1.24 W·m−1·K−1 from 25 °C to 1200 °C, which is visibly lower than that of Lu 2 SiO 5 coating. • A novel nanostructured Lu 2 Si 2 O 7 /Lu 2 SiO 5 environmental barrier coating was fabricated successfully. • The bonding strength of nanostructured Lu 2 Si 2 O 7 /Lu 2 SiO 5 coating is 14.9 MPa. • The thermal conductivity of Lu 2 Si 2 O 7 /Lu 2 SiO 5 coating is 0.59 W·m−1·K−1–1.24 W·m−1·K−1, which is lower than that of Lu 2 SiO 5 coating. [ABSTRACT FROM AUTHOR]