We use bivariate Poisson point process(BPPP) to model the scenario where a wireless ad hoc broadcast network coexists with a wiretapping network.By using stochastic geometry tools

we study the secrecy broadcast transmission capacity of wireless ad hoc network

which is defined as the product among the spatial density of broadcast transmissions without secrecy outage

the average number of neighbors of a broadcasting node

and the secrecy rate.We first derive the average number of eavesdropping neighbors that causes secrecy outage and then characterize the secrecy broadcast transmission capacity over general fading and Rayleigh fading channels.Finally

numerical results are presented to show that in comparison to the case without correlation

the correlation between the legitimate nodes and the eavesdroppers degrades the secrecy broadcast transmission capacity.