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Glass fibers (GFs)/epoxy laminated composites always present weak interlaminar shear strength (ILSS) and low cross-plane thermal conductivity coefficient (λ⊥).In this work,silica-sol,synthesized from tetraethyl orthosilicate (TEOS) and KH-560 via sol-gel method,was employed to functionalize the surface of GFs (Si-GFs).Together with a spherical boron nitride (BNN-30),the thermally conductive BNN-30/Si-GFs/epoxy laminated composites were then fabricated.Results demonstrate that Si-sol is beneficial to the improvement of mechanical properties for epoxy laminated composites (especially for ILSS).The BNN-30/Si-GFs/epoxy laminated composites with 15 wt％ BNN-30 fillers display the optimal comprehensive properties.In-plane λ (λ//) and λ⊥ reach the maximum of 2.37 and 1.07 W.m-1.K-1,146.9％ and 132.6％ higher than those of SiGFs/epoxy laminated composites (λ//=0.96 W.m-1.K-1 and λ⊥ =0.46 W.m-1K-1),respectively,and also about 10.8 and 4.9 times those of pure epoxy resin (λ// =λ⊥,0.22 W.m-1.K-1).And the heat-resistance index (THRI),dielectric constant (ε),dielectric loss (tanδ),breakdown strength (E0),surface resistivity (ρs) as well as volume resistivity (ρv) are 197.3 ℃,4.95,0.0046,22.3 kV.mm-1,1.8 × 1014 Ω,and 2.1 × 1014 Ω.cm,respectively.