Aiming at the dwell scheduling of phased array radar, an adaptive method based on a novel on-line pulse interleaving technology is proposed. The time and energy vectors with variable length are introduced to realize the pulse interleaving, whose idea comes from the scheduling analysis method based on the scheduling interval. The novel online pulse interleaving technology is combined with the scheduling method based on the time pointer. Therefore, the resulting scheduling algorithm is a perfect combination of two types of adaptive dwell scheduling methods. Compared with existing dwell scheduling algorithm with pulse interleaving, the proposed algorithm is more general, and can be applied to tasks with multiple pulse repetition intervals. The simulation results demonstrate the effective of the proposed dwell scheduling algorithm.