The M-radical of V(CFT type) is determined and a criterion for irreducibility of an admissble module for an arbitrary vertex operator superalgebra V is given.

• 设V是一个顶点算子超代数；M是一个可容许的V-模.；刻划了V的M-根(V是CFT型的)；并给出了一个可容许V-模不可约性的差别准则