The invention relates to a playback method of production process for a nuclear power plant and a system. The method comprises the steps of: collecting the real time data of the production process of the nuclear power plant, filtering, compressing and storing the real time data collected; receiving a playback request, starting the client, connecting and loading the historical database information, and loading the homepage; getting the historical data of page in the period for request; synchronizing the historical data obtained and the request page; and displaying the page synchronized with the data to the users. The invention further relates to a playback system of the production process for the nuclear power plant, comprising a data collecting unit, a data processing and storing unit, a playback controlling panel, a starting and loading unit, clients, a request processing unit, a synchronization processing unit and a cache unit. The invention achieves the random call of page playback in any period and can analyzing the faults accurately and quickly, which increases the safety factor of safe operation of the unit, reduces the labor cost and time cost for the analysis and process of faults.