Multiple switches need to be triggered in parallel in a linear transformer driver (LTD) cavity where tens of bricks connect in parallel and switch-to-switch isolation is necessary. The lack of transient isolation will result in poor tolerance to switch jitter which manifests as increased probability of late-firing switches and further affect the output performance of LTD cavity. To optimize the type and parameter of the isolation element, the resistive and inductive isolation modes were compared in circuit simulation and experiments. The results show that the inductive isolation has better effect than resistive isolation both for synchronization of switches and the load voltage of LTD cavity. Among the inductors with different inductance, the 5 μH inductor has the best output data.