Abstract: The computer supervision and control systems（CSCS）for the pumped storage power stations supplied by suppliers abroad,face problems such as equipment aging,insufficient system functions,spare parts,after-sale service,etc. This paper introduces the current technology status of the domestic pumped storage power station CSCS,describing and researching domestic modification schemes for CSCS of Pumped Storage Power Station. The paper analyses three ways of domestic modification for hydropower plants CSCS,then discusses those ways of domestic modification for pumped storage power station CSCS,summarizing two models:with middle transformation instruments added and with nothing added. The characteristics of those typical cases with middle transformation instruments added are discussed which are Zhanghewan Pumped Storage Power Station,Guangzhou B Pumped Storage Power Station,Guangzhou A Pumped Storage Power Station. This paper researches those problems in modification schemes for those cases which the LCU main computer is IPC with nonstandard communication protocol in it,Henan Baoquan Pumped Storage Power Station,Hubei Bailianhe Pumped Storage Power Station,Guangzhou Huizhou Pumped Storage Power Station. Based on the project of domestic modification for computer supervision and control system of Baoquan Pumped Storage Hydropower Station,studies its domestic modification schemes for computer supervision and control systems without any transformation instrument.