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Time-dependent is the typical characteristic of node and network and the classical approach for time-variant reliability analysis relies on the computation of outcrossing rates. In order to get the outcrossing rate, the usual outcrossing approach uses a FORM method to compute the instantaneous reliability index at each time. FORM method likely lead to decrease of the result’s accuracy when the limit state function is high nonlinear. In this paper, a new approach combined PSO with outcrossing approach is proposed to solve this problem and the instantaneous reliability index is computed by PSO. Then numerical and engineering cases are carried out to compare this method with outcrossing approach and Monte-Carlo simulation, and the results show that the new approach appears more accurate.