Abstract: Inductive inference psychological effects point out the extent that various factors in the inductive arguments affect the inductive judgment power, according to the factors and their effective ways, which mainly includes category effect, property effect, and mutual effect. The authors suggest that individuals usually judge the power with dividing-integrating ways, and more important is that the reasoning array formed during the inductive judgment and the smooth feeling sequentially produced directly affect the evaluation to the inductive power. Lastly, the authors gave proof to this model

Key words: inductive inference, category effect, property effect, inductive power, smooth feeling, PPP principle