The invention provides an initial positioning device, container and method. The container comprises a container body, a variable pressure assembly, a metering channel and a discharging channel; when the pressure of the variable pressure assembly is decreased, objects contained in the container body enter the metering channel; when the pressure of the variable pressure assembly is increased, the objects contained in the metering channel flow outwards through the discharging channel. The container further comprises the initial positioning device. The initial positioning device comprises a backflow cavity, a backflow channel and an assembly capable of closing the backflow channel. The backflow cavity is communicated with the variable pressure assembly and the initial end of the metering channel. The initial end of the metering channel is higher than the bottom of the backflow cavity. The backflow channel is communicated with the bottom of the backflow cavity and the container body. The container is simple in structure, convenient to use and accurate in metering.