Abstract: A new symbolic coded algorithm NSCA of generating symbolic network functions is presents.In NSCA,the base code of coded cell prescribed each component is much lower,so it prevents early orerflow of integer.The scale of the circuit analyzed then can be larger.It also provides sensitivity algorithm and simplify algorithm,and processes a circuit with definite function as a model circuit,which enlarge the application.A computer program SNSPC2.0 (symbolic network simulation by parameter coded)which is based on NSCA is developed,and its effectiveness is illstrated with examples.