Abstract: The concepts of the test deterministicity of the fuzzy testing and the stochastic fazzy testing,as well as the relations between the test detenninisticity,the portent-reause membership function and the pro bability density function of the stochastic portent signal are discussed.The model of the stochastic fuzzy testing system is constructed.The formula for calculating the quan-titative characteristics of the determinsticity of the stochastic fuzzy testing the test deterministic degree is presented;the relations between the deterministic degree and the portent-cause membership function are analysed.The influence of the probability density func-tion of the stochastic portcnt signal on the membership function and the deterministic degree is also discussed and calculated.

Key words: fuzzy sets, checkout, stochastic processes, measures