From Dec 2015 to May 2016, nine Pallas's squirrels (Callosciurus erythraeus) were radio tracked at Shanghai Zoo. Home range sizes, spatial shapes and overlaps between individuals were inferred via minimum convex polygon (MCP) and 95% kernel-based estimators. Behaviour was also observed and recorded from line transect surveys. The average home range size was found to be 12376㎡ (MCP)-18146㎡ (95%Kernel). The home range size of male individuals was not significantly larger than females (Independent-sample t test，t=-0.101，P=0.922). There is no significant difference between the overall ranges in winter and those observed in spring (One way ANOVA，MCP：F=3.900，P=0.070；95%FK：F=3.566，P=0.081). There were overlaps between home ranges of different individuals with OI 0.36-0.63 in winter and 0.02-0.43 in spring. The diurnal behaviour of Callosciurus erythraeus was observed to comprise travelling (29.4%), feeding (25.1%) and resting (24.7%), though in winter, time spent feeding (33.3%) was significantly higher than that observed in summer (16.4%) (One way ANOVA，F=119.268，P<0.001). Territorial behaviour also varied significantly between different seasons (One way ANOVA，F=140.416，P<0.001). The diurnal activities of Callosciurus erythraeus showed a “U” pattern with active periods from 05:00-08:00 and 15:00-18:00, and a primary resting period from 12:00-13:00.