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Large High Altitude Air Shower Observatory (LHAASO) is a composite cosmic ray observatory consisting of three types of detectors: KM2A, WCDA and WFCTA. One of the main scientific objectives of LHAASO is to measure the cosmic ray spectrum and composition precisely. With hybrid detection of WCDA and WFCTA, one can further study the "Knee" of cosmic rays from 100TeV to 10PeV. The original components of cosmic rays can be effectively distinguished with four parameters provided by WFCTA, WCDA and MDA, respectively. The energy reconstruction resolution of proton shower is about 20% reconstructed only by WFCTA. Combining with the energy flow of shower core provided by WCDA, a better energy resolution is expected.

Accurate Measurement of the Cosmic Ray Proton Spectrum from 100TeV to 10PeV with LHAASO