The invention relates to the field of computers, in particular to a simulation environment establishing method and a system based on field data, and the method comprises the steps: carrying out the data access of a plurality of data sources through calling a standard data service interface, collecting the field real-time data and the historical data of a magnetic disk, and storing the collected data; and reading the stored data to play the data, and writing back the data to the real-time database of the test machine to be called by the upper application module. The method has the advantages that data access is conducted on multiple data sources by calling the standard data service interface, field real-time data and disk historical data are collected, simulation building is conducted on the field real-time data and the disk historical data, and higher accuracy is achieved; the simulation test module reads the data stored by the data acquisition module to play the data, writes back thedata to the real-time database of the test machine for the upper application module to call and remove wrong data, improves the accuracy of the simulation test, and meets the requirements of softwareproduct display at the same time.