【正文】
present, in many areas of production and life, especially the industry, liquid level control is to the realization of the many indicators has very important function, therefore level automatic control system has a very mature and the widespread application, types and the way also because different occasions and environment and different, this paper adopts parative simple float mechanical level control system as automatic control principle analysis of time of the project research object, the whole system model is established, the parameters integration analysis, and then the stability of the system as a whole, the main index and error analysis of time domain, and through MATLAB simulation, make order st