In this Research, in order to improve problems of not enough technical validation and structural and hydraulic stability
evaluation when nature-friendly revetment block is applied to field, hydraulic stability evaluation according to hydraulic
behavior change of porosity soil block for vegetation reinforcement that secures ecological function was reviewed. By
selecting object section, numerical analysis and hydraulic model experiments were performed; for numerical analysis, by
using 1-dimensional numerical analysis model HEC-RAS and 2-dimensional numerical analysis RMA-2, one-dimensional(1D)
and two-dimensional(2D) numerical analysis were performed; by applying Froude's similarity law, reduced-scale hydraulic
model experiments according to vegetation existence were performed. In hydraulic model experiment, for validity of
experiment result, the result of velocity and tractive force of reduced-scale hydraulic model experiments was converted to
prototype so that it can be compared and reviewed under the same condition of one-dimensional(1D) and
two-dimensional(2D) numerical analysis result; as a result, it was confirmed that comparatively united result appeared, and
by comparing prototype-converted tractive force result with revetment’s allowable tractive force coming from an existing
research, block’s hydraulic stability was suggested.