Abstract: Resonant converters represented by LLC have received widespread attention due to good soft switching performance and high-efficiency power transmission. However, the pulse frequency modulation will lead to significant efficiency sacrifice due to the offset of the resonant point. The DCX state of resonant converters is good for efficiency optimization but the voltage regulation range is limited. In addition, full power transmission will also lead to high device stress and efficiency optimization limitations. In recent years, partial power transmission has achieved a wide range of applications due to the advantages of low stress, high efficiency and simple control. Combining resonant converters with partial power technologies to strengthen the complementary advantages and increase the application value has become a hot research topic. In this paper, the existing partial power regulated structures based on resonant DCX are outlined from the original concept and basic connection, which are summarized into three types: single-stage, two-stage and quasi-two-stage. The system topologies and control methods of partial power systems are discussed and analyzed in detail. Besides, a summary of the performance indicators achieved so far is provided, and a comprehensive comparison is conducted on the device counts, voltage gain and operating efficiency of the traditional two-stage cascaded structure and three partial power structures. Finally, the advantages, disadvantages and application limitations of different kinds of structures are summarized, and the future development trend is outlined, which can provide a reference for the subsequent research.