Abstract: The general method for calculating wetted perimeter, normal depth, critical depth, the Froude number and conjugate depth of hydraulic jump of n-th parabolic channel is presented in this paper. The studies of the wetted perimeter of n-th parabolic channel are carried out by integral or numerical integration, the normal depth of n-th parabolic channel is analysed according to the theory of the open channel uniform flow, a computing method of the critical depth, the Froude number and the conjugate depth of hydraulic jump of n-th parabolic channel are studied based on the theory of critical depth and the conjugate depth of the hydraulic jump. The general computing formulas of the wetted perimeter, normal depth and critical depth, the Froude number and the conjugate depth of the hydraulic jump of n-th parabolic channel are given, the iterative formula of the conjugate depth is given and the convergence of an iterative formula is proved, and examples for verification of the formulas are presented. The research of the general method for calculating the wetted perimeter, normal depth, critical depth, the Froude number and the conjugate depth of hydraulic jump of n-th parabolic channel with a simple calculation process and a high calculation precision can provide a reference for practical engineering design.