Abstract: Based on an analysis of the structure, traits and mechanical strength characteristics, sheath destruction test of individuals and overall package of stem-leaf sheath rubbing destruction test were carried out separately. The basic strength and failure modes of individual damage of leaf sheath were established. The optimal split leaf sheath methods were summarized which were in line with its growth traits and strength characteristics of sheath. Destruction of the leaf sheath was best achieved by individuals in the form of parenchyma under transverse tensile forces tear, with the maximum transverse tensile strength(σ_2max) being 0.90 MPa. After tearing the leaf sheath, the connection strength of the leaf sheath and stern (σ_2max) was 0.78 MPa. The first step of splitting leaf sheath was to stretch sheath laterally to tear sheath and destroy the cover of sheaths to the stalks. Then, sheaths should be scratched axially to rip sheath from the stem. To accomplish the sheath stripping completely, the following 2 basic conditions should be met. Stress that perpendiculars to the direction of leaf sheath fibers （σ₂） should be no less than the maximum lateral tensile strength σ_2max. Axial stress (σ₁) should be no less than σ_tmax, which is the maximum strength of resisting ripping of leaf sheath and stem.