Taking full account of the high reliability of nowaday network technology

the instance of unsuccessful service can be ignored.This paper re-defined the system heavy load condition at embedding points

under which the performance of double-star is re-evaluated through the mathematical modeling.As the result

the customer transfer probability

P

ij

and the mean detained time of the customers are given

and then the performance evaluation is done through simulation.Compared with previous performance evaluation

with the concise mathematical analysis and conclusion

this investigation has not only theoretical value

but also practical value.