Sexual interference behavior in non-human primate species is defined as the behavior with which non-mating individuals disturb a mating pair. The forms of sexual interference can be further divided into interruption and harassment in primates. The former is more disruptive and leads to termination of the copulatory sequence, and is mostly employed by adult males. The latter is mild interference such as approaching and touching or slapping the recipient, and is shown by immature individuals as well as adult females. Such interference does not necessarily lead to the termination of copulation. Numerous hypotheses have been proposed and examined for the function of sexual interference, but there is no hypothesis that can explain all types of sexual interference. Sexual interference may have multiple functions across species and among different age-sex classes in the same species. For this reason, the hypothesis of sexual interference is not consistent and hinders the research of this field. The aim of this paper is therefore to review the sexual interference behavior in 36 non-human primate species, and discuss the function and significance of this behavior. The proximate factors of sexual interference is related to reassurance of the "affiliative" bond between harasser and harassed which is manifested in: (1) Possessiveness (sexual interference is an emotional response to the threat of a disruption of affiliative bonds existing between the harasser and one or both of the mating pair); (2) Insecurity at weaning (sexual interference is an expression of separation anxiety of a young animal, an insecurity at weaning, during copulation of its mother). Proximate factors can reveal the motives of interference, but further research has demonstrated the ultimate consequences of sexual interferences, which are manifested in: (1) Parent-offspring conflict (Interfering in their mother's mating results in delaying or a new conception hence reducing the competition for maternal care between siblings.); (2) Sexual competition (the interference stops or delays the mating, resulting in reduced reproductive effectiveness of the copulant and thus increases her or his own breeding effectiveness). It can be concluded that the sexual interference is a selfish behavior to improve the protagonists own interests, rather than revenge behavior suggested by early research. Disturbed individuals also produce counter strategies, such as mating calls or active avoidance behavior. This should be further investigated. Sexual interference is associated with the mating system, and is characterized by low frequency and low intensity in polygyny species, and high frequency and high intensity in multimale-multifemale mating systems. Sexual interference behavior is affected by species, gender, age, rank, genetic, physiological, social structure and social situation and has significant inter-and intra-species differences. In this paper the research results of sexual interference in the Sichuan golden monkey and sexual interference behavior of non-human primate species are summarized systematically from the type of sexual interference, the response of interferers, the function of sexual interference and related hypotheses. The significance of this paper is to provide a reference for related researches in China and ideas for further studies of reproductive behavior, and thus promote the development of study in this field.