From April 2016 to April 2017, seasonal variation of daily activity patterns and diet of yellow-throated martens (Martes flavigula) were studied using fecal analyses (frequency of occurrence and relative weight of remains) and Infrared Triggered Camera Technology in Liziping National Nature Reserve, Sichuan Province, China. We found that the activity of yellow-throated martens mainly occurred during the daytime, diurnal activity accounting for 85.64% of the total independent photographs. Pearson's chi-squared test showed that there was no significant difference in activity patterns of yellow-throated marten in different seasons (χ²=126.950, df=132, P=0.608). However, the peak time of activity patterns showed a certain difference among different seasons. The peak of the activity density occurred at 16:00-19:00 in spring (31.65%), 15:00-18:00 in summer (26.32%), 13:00-16:00 in autumn (34.31%), and 11:00-14:00 in winter (25.00%). In addition, there was more nocturnal activity in winter than that of the other three seasons. The content of yellow-throated marten feces could be classified into 4 groups: mammals, birds, insects and plants. Mammals（95.28% occurrence and 80.99% dry weight）were the major food of yellow-throated martens throughout the year. The food habits of yellow-throated martens varied in different seasons. Mammal remains in the feces appeared most frequently in spring, summer and autumn. Bird remains also appeared frequently in spring. The proportion of plants in the feces of yellow-throated martens was obviously increased in winter. Our results show that both daily activity patterns and diet of yellow-throated marten have certain differences in different seasons, which might be related to its seasonal breeding characteristics and physiological metabolism. These results are very helpful to a better understanding about the life history and survival strategy for yellow-throated martens, and provide a fundamental data and study for the protection of yellow-throated martens.