Liquid-phase ultrasonic exfoliation approach was applied to acquire ultrathin lithium iron (II) phosphate (LiFePO4) nanosheets (LFP-NS) with the thickness of only ∼15nm. The LFP-NS were then self-assembly with graphene oxide (GO) with amido bonds. Ultrashort diffusion pathways to lithium ions (Li+) could be achieved with high percentage of (010) facets exposed to LFP-NS, which reduced the diffusion distance for Li+ along the [010] direction effectively. In addition, the reduced graphene oxide (rGO) firmly adhered to the surface of LFP-NS by self-assemble method after sintering, which formed an excellent conductive network and facilitate electron transportation. The ultrathin diffusion channels into Li+ and tight conductive network resulting in an excellent high rate discharging performance, e.g. up to 102mAhg−1 at 30C, while discharge capacity retention can reach to 93.4% at 20C after 500 cycles. This kind of composite was an ideal cathode material used in high rate lithium ion batteries.