The Saker Falcon (Falco cherrug) has been rapidly becoming endangered in the world. We analyzed the gender, signal duration, and missing month of 67 Saker Falcons tracked by satellites in the past 10 years, and their causes of death, threat factors and loss rates. We performed a more detailed analysis of the causes of death of 10 sakers from Russia and Mongolia during 2016 and 2017. Backpack method was used to fit the transmitters with the weight (17 g to 22 g) less than 3% of sakers′ body weight (Fig. 1). When the transmitters no longer returned information, we went to the last locations of the GPS to search for the bodies of died birds in a certain area. We also investigated the animal traces and surrounding environment, and performed an autopsy to analyze the cause of death. As to the 67 sakers, 37 were females (55.2%), 29 were males and one was unknown. The binomial test showed that there was no difference in sex ratio (P > 0.05). The average signal duration was 201 ± 129.9 days (n = 64); with 39 sakers less than 200 days (accounted for 60.9%), and 59 sakers less than 400 days (accounted for 92.2%) (Fig. 2). The annual return rate was 31.4%; and 45 sakers (accounted for 67.2%) were lost during August to December (Fig. 3). Of the 10 sakers being tracked in 2016, we obtained information on four lost ones, one was hunted in Mongolia, one was unclear, one died of electric shock (Fig. 4) in the west of China, and one died due to collision and hunger (Fig. 5) in China (Table 1). The significant low annual return rate of satellite tracking sakers indicated that the situation of Saker Falcon was not optimistic, causing concerns among the raptor research experts.