Extra-Pair paternity (EPP) is defined as the offspring resulting from copulations outside the social pair bonds in the mating system. Field studies and comparative analyses have shown that EPP is due to female strategy. Females might obtain direct or indirect benefits through EPP. Female choice hypothesis predicts that females can pursue EPP and choose the preferred EPP males. By the contrary, EPP is constrained by males mate guarding behavior and females show no preference in the trade-off hypothesis. Taiwan yuhinas（Yuhina brunneiceps）is a joint-nesting, cooperatively breeding bird. The reproductive skew is low (0.19). Individuals in the breeding group share the load of nesting, the incubation and the provisioning. EPP has been recorded by observation in Taiwan yuhinas and there are 25.5% of EPP offspring have been recognized by paternity analysis. Data was selected from the breeding seasons during 2001-2006. Results showed that females prefer high-ranking males as EPP males and females might obtain indirect benefits from producing EPP offspring. Each member in the breeding group with its own demand and aim adapts different breeding strategies to get the highest reproductive benefits. Therefore, EPP is one kind of reproductive strategy in Taiwan yuhinas.