Abstract: Vanadium dioxide(VO₂) has attracted extensive research interest benefiting to its outstanding semiconductor-to metal phase transition properties, VO₂ shows great potential in various applications. However, it's quite challenging to control the width of hysteresis loops to meet different applied conditions. In this paper, bamboo-like VO₂(M) nanowires were synthesized by annealing treatment with the precursor VO₂(A) nanowires. The as-obtained VO₂ nanowires were self-assembled from grains and had a porous structure. It was found that the flow rate of nitrogen has an effect on the morphology and microstructure of VO₂(M) nanowires, the size of the grains that make up the nanowires and the number of internal pores of nanowires gradually decreases as the nitrogen flow rate increases from 0.18 L/min to 1 L/min. According to the phase transition parameters of a single VO₂(M) nanowire, it was found that different types of nanowires had different thermal hysteresis loop widths. The results show that the width of the thermal hysteresis loop of VO₂(M) nanowires can be adjusted by nitrogen flow rate, and the width can be varied from 1 ℃ to 3 ℃, which is of great significance for practical applications.