Perspective Effects is a kind of phenomenon which refers to the four-card selection task, when participants to test condition rules from different perspectives, the selection bias steadily changes in the card P, -Q and -P, Q. Perspective Effects has an important impact on the four-card selection task, to the date, its existing conditions and mechanism remains controversial. The current study employed three experiments to investigate the effect of perspective effects on four-card selection task and mechanism remains. Experiment 1 asks the participants to go through different four-card selection tasks of social conversion model, causal model and abstract model in different perspectives respectively to explore the perspective effects. we used a 3 ( rule type : social conversion rule model, causal rule model, abstract rule model ) ×2 ( perspective : P&-Q condition, -P&Q condition) repeated measurement design. P&-Q condition that makes participants more inclined to choose P&-Q combination of experimental conditions. -P&Q condition similar to this. In Experiment 2, we use the same design with experiment1 to explore which condition is easier to generate the abstract rules of perspective effects in the providing of counter-examples and the necessary and sufficient conditions under rich contents of abstract rules. Experiment 3 further studies the essential relationship between the four-card selection task and the corresponding conditional reasoning. In conditions reasoning, we use a 2 (perspective) × 2 (rule type) × 4 (reasoning form) mixed design. Perspective between the variables were tested with two levels (P&-Q conditions; -P&Q conditions), there are two levels of rule types which is the conversion of social contractual and non-contractual society , each rule type has four the form of reasoning, namely modus ponens, affirming the consequent, modus tollens, denying the antecedent . Rule types and reasoning form are within-subject variable. Four-card selection task has the same design with experiment2. The results show that: (1) the results of experiment1 show that the perspective effects do exist in the social contract model and causal model while do not exist in the abstract model. (2) A rich supplying and counter-examples providing are more conducive to generate perspective effects. (3) There is a separation phenomenon between the four-card selection task and conditional reasoning problems, between four-card problem and the corresponding conditional reasoning don’t have a logical consistency. Compared with prior studies, the present paper has systematically studied the conditions which would affect perspective effects. at the same time, by comparing the four-card selection task with the corresponding conditional reasoning to study the nature of perspective effect mechanism. In conclusion, we find that provide counterexamples than necessary and sufficient conditions are more likely to have perspective effect, domain-general and domain-specific cannot fully explain perspective effect of four-card selection task, we suggest the existence of a mechanism to regulate the field of general or special mechanism.