A sample analysis system comprising: a sample analyzer; and T a cleaning liquid preparation apparatus adapted to prepare and supply a cleaning liquid to the sample analyzer; wherein the sample analyzer comprises a measurement unit adapted to measure a sample and a reservoir adapted to store the cleaning liquid prepared by the cleaning liquid preparation apparatus, and wherein the sample analyzer is adapted to clean at least a part of the measurement unit with the cleaning liquid, wherein the reservoir comprises a first detector adapted to detect that the liquid amount reaches a first amount and a second detector adapted to detect that the liquid amount reaches a second amount less than the first amount, wherein the cleaning liquid preparation apparatus comprises a supply unit adapted to supply the prepared cleaning liquid to the reservoir, and a controller adapted to control the supply unit and selectively execute: a first supply mode in which the supply unit supplies the cleaning liquid to the reservoir when the first detector detects that the liquid amount reaches the first amount, and a second supply mode in which the supply unit does not supply the cleaning liquid to the reservoir when the first detector detects that the liquid amount reaches the first amount and the supply unit supplies the cleaning liquid to the reservoir when the second detector detects that the liquid amount reaches the second amount, wherein the second supply mode is executed in response to a preset condition being met. a sample analyzer; and T a cleaning liquid preparation apparatus adapted to prepare and supply a cleaning liquid to the sample analyzer; wherein the sample analyzer comprises a measurement unit adapted to measure a sample and a reservoir adapted to store the cleaning liquid prepared by the cleaning liquid preparation apparatus, and wherein the sample analyzer is adapted to clean at least a part of the measurement unit with the cleaning liquid, wherein the reservoir comprises a first detector adapted to detect that the liquid amount reaches a first amount and a second detector adapted to detect that the liquid amount reaches a second amount less than the first amount, wherein the cleaning liquid preparation apparatus comprises a supply unit adapted to supply the prepared cleaning liquid to the reservoir, and a controller adapted to control the supply unit and selectively execute: a first supply mode in which the supply unit supplies the cleaning liquid to the reservoir when the first detector detects that the liquid amount reaches the first amount, and a second supply mode in which the supply unit does not supply the cleaning liquid to the reservoir when the first detector detects that the liquid amount reaches the first amount and the supply unit supplies the cleaning liquid to the reservoir when the second detector detects that the liquid amount reaches the second amount, wherein the second supply mode is executed in response to a preset condition being met. a supply unit adapted to supply the prepared cleaning liquid to the reservoir, and a controller adapted to control the supply unit and selectively execute: a first supply mode in which the supply unit supplies the cleaning liquid to the reservoir when the first detector detects that the liquid amount reaches the first amount, and a second supply mode in which the supply unit does not supply the cleaning liquid to the reservoir when the first detector detects that the liquid amount reaches the first amount and the supply unit supplies the cleaning liquid to the reservoir when the second detector detects that the liquid amount reaches the second amount, wherein the second supply mode is executed in response to a preset condition being met. a first supply mode in which the supply unit supplies the cleaning liquid to the reservoir when the first detector detects that the liquid amount reaches the first amount, and a second supply mode in which the supply unit does not supply the cleaning liquid to the reservoir when the first detector detects that the liquid amount reaches the first amount and the supply unit supplies the cleaning liquid to the reservoir when the second detector detects that the liquid amount reaches the second amount, wherein the second supply mode is executed in response to a preset condition being met.