There are still many problems about producing precision of the large pump nowadays,while rightly less studying the large pump on home and abroad.However,the large prototype pum〖BF〗p’s〖BFQ〗 performance is a crucial basis to judge its quality.Through consulting the material,it implies that the analysis for the flow random error of the prototype pump test is very vital to produce the highquality pump.The error analysis by comparisons proves that choosing a proper way of collecting and solving data can improve the pum〖BF〗p’s〖BFQ〗 performance condition directly,so as to improve its quality.