Abstract: The accelerated contracting flow generated by hydropower plant power generation and discharge in the intake area has certain attractive and entraining flow field effects on fish in the near-dam area, playing an important role in helping fish in the upstream near-dam area enter the intake and pass through the power generation discharge channel downstream. To understand the downstream migration strategies and influencing factors of juvenile fish in the accelerated contracting flow at the intake, and to optimize hydropower plant operation and design, laboratory simulations of the accelerated contracting flow formed at the dam's intake were conducted to study the downstream migration strategies of juvenile fish. The results show that increasing the inlet flow rate can significantly raise the probability of juvenile domestic fish being carried downstream by the accelerated converging flow before the dam. The flow velocity in the fish-carrying area upstream of the dam is close to but slightly lower than the critical swimming speed of juvenile domestic fish, achieving the optimal downstream transport effect. Under the same accelerated converging flow at the inlet, among the fish species, bighead carp (Aristichthys nobilis) are most prone to actively follow the flow downstream, black carp (Mylopharyngodon piceus) are most likely to escape, and silver carp (Hypophthalmichthys molitrix) exhibit the strongest ability to regulate their body condition during the downstream transport process. When being carried downstream by the accelerated converging flow, juvenile domestic fish prefer to move along the walls in the low-velocity marginal areas.