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We propose a novel design of superconducting nanowire avalanche photodetectors (SNAPs), which combines the advantages of multistage avalanche SNAPs to lower the avalanche current I _AV and that of series-SNAPs to reduce the reset time. As proof of principle, we fabricated 800 devices with large detection area (15 μm × 15 μm) and five different designs on a single silicon chip for comparison, which include standard SNSPDs, series-3-SNAPs, and our modified series-SNAPs with double-stage avalanche structure 2*2-SNAPs, 2*3-SNAPs, and 3*3-SNAPs. The former three types of the detectors demonstrate fully saturated device detection efficiencies of ~20% while the latter two types are latching at larger bias currents. In addition, the I _AV of 2*2-SNAPs is only 64% of the switching current I _SW that is lower than series-3-SNAPs (74%) and well below that of 4-SNAPs (84%) reported elsewhere. We also …