The mooring profiler (McLane Moored Profiler), referred to as MMP, is a self-contained multi-sensor underwater working platform produced by McLane Corporation of the United States. Depending on the loaded sensor, it can provide long-term profiles of marine environmental parameters such as temperature, salinity, flow velocity, fluorescence, irradiance, dissolved oxygen, and trace elements. The new MMP incorporates all the functions on the prototype developed by the Advanced Engineering Laboratory of the WoodsHole Oceanographic Institution. The single structure design makes the MMP easier to deploy and use at sea and easier to maintain. The MMP climbs and dives repeatedly according to a programmed trajectory along a moored steel cable, and controls the sensor group to collect data in the water body. The pattern work mode added by the new MMP allows users to freely define the MMP work time, work depth, profile resolution, motion trajectory and sampling progress. Thus, it can more flexibly meet the scientific research needs of users. According to the calculation of the sea test data, the theoretical working time of the MMP can reach 1 year, and the cumulative mileage of the MMP exceeds 10,000 meters. The MMP body is wrapped by a polyethylene shell, and inside is a cylindrical titanium alloy sealed electronic compartment that houses the control circuit, data recording system and battery; the glass ball on the top of the bracket is only used to provide buoyancy to offset the body itself in the sea the weight of.