Research shows that traditional property bounds of wireless sensor networks（WSNs） are too loose.Based on network calculus

output bound of data flow traversing node is improved

and more accurate property bounds of WSNs is derived

including node transfer delay upper bound

node buffering requirements lower bound and node service rate lower bound.Numerical analysis results illustrate that the more network hops numbers and the smaller node depth are

the bigger difference between traditional property bounds and this paper’s property bounds is.It means that the larger network scale is

the more resources can be saved in WSNs configuration according to this paper’s property bounds.