In this paper, a detailed study of the linear dynamic range of the domestic low-resistance microchannel plate (MCP) in DC mode is carried out. In the experiment, a deep ultraviolet light source (low-pressure mercury lamp) is used to excite the MCP with a gold film in order to obtain a wide range of input current, and then various parameters related to the linear dynamic range of the low-resistance MCP are tested. These parameters include resistance, gain, strip current, the maximum and minimum input current, etc. The results show that reducing the resistance can effectively improve the linear dynamic range of the MCP, and the maximum and minimum input current span over 6 orders of magnitude. The low-resistance MCP has a maximum output current of 16% to 19% of the strip current under three different operating voltages. It has comparable performance to the international high-output MCP technology and can be applied in related fields.