The invention discloses a system dynamics based generalized guaranteed service operation analysis method under the new electricity reform. The method includes the steps of firstly, collecting relevantdata including electricity consumption amount of electricity universal service and electricity normal service, transmission and distribution electricity price composition, economic benefits, non-economic benefits and the like; secondly, establishing a causal relationship between the electricity normal service and the electricity universal service represented by the generalized electricity guaranteed service under the new electricity reform; thirdly, based on the causal relationship, performing function design on involved parameter variables, and performing global normalization processing; andfourthly, according to the causal relationship and the designed parameter variables, establishing a system dynamics stack flow diagram model through the VENSIM, and running the model to analyze changes in indicators requiring attention under different environments. From the perspective of system dynamics, the method of the invention establishes the model of the electricity normal service and theelectricity universal service and a game relationship between the two, and studies the competition relationship and implementation effect of the two in different external environments.