Abstract: The regulations and systems on the work of party branches of the communist party of China (CPC) are the normative system formulated and implemented by the CPC at a certain level to regulate the work and activities of party branches and related subjects. Marxist practical view, legislative theory and democratic centralism are the theoretical basis for formulating the regulations and systems on the work of party branches. With the investigation on the changes and development of the previous party constitution, other inner-party regulations and normative documents on the work of party branch, the research finds the emergence, formation and development of the regulations and systems on the work of party branches is a historical process of creative construction based on the continuous changes of the world, national conditions and party conditions. The regulations on the work of party branches are not only a basic system of inner-party laws and regulations, but also a main system in the work system of primary party organizations. Regulations on the Work of Party Branches of CPC (Trial Implementation) is the first basic and backbone law to standardize the work of Party branches in the history of the CPC. It is an important system innovation extending from strictly governing the party to party branches and party members. It fills the gap of branch work regulations in the construction of grass-roots party organization system, marking that the work and activities of party branch step into the standard and standardized track in an all-round way.