[Objectives] Reversed sexual dimorphism (RSD) is a deep issue in evolutionary biology, which helps us to understand the adaptation and evolutionary process of species. Predatory bird species are well known for their RSD in size, and the degree of RSD is closely related to the type of main prey. Unfortunately, little is known about the sexual dimorphism in wing shape and limb muscles that characterize the flight and grasping ability of predatory birds. [Methods] In this study, 12 adult individuals of Common Kestrel (9 females and 3 males) were compared by the measurements of 6 wing morphological parameters, as well as the muscle masses of the pectoral muscles and 14 muscles related to toe’s grasping, to detect the intersexual differences. Independent sample t-tests were used to evaluate whether there were significant differences between sexes in 6 wing parameters and 16 muscle masses. Given that the difference in body size was significant, differences in above-mentioned parameters between sexes for a given body size were tested using an analysis of covariance (ANCOVA) with body mass as covariate. [Results] The results showed that the wingspan, wing area, and wing loading of female birds were greater than those of males, but the wing tip of males was sharper than that of females (Table 1). Statistically, these differences were non-significant, but indicated the higher flight efficiency of male birds which was beneficial for providing sufficient food for the female and nestlings. Muscle mass is directly proportional to power output and determines the overall functional capacity of a muscle. The mass of the pectoralis muscle in females was higher than that in male birds, and showed significant RSD. But for the 14 pelvic muscles, only flexor perforans et perforatus digiti II and adductor digit II presented significant RSD (Table 2). Results in the leg muscles mainly suggested similar grasping capability between genders, and on the other hand, also indicated that the second toe of female birds has a strength advantage when hunting. [Conclusion] Based on previous studies and the results of Common Kestrel, it is speculated that the RSD and its degree in wing shape and limb muscle masses might be similar to that of RSD in size, and also highly related to the type of main prey.