A sample analysis system comprising: a reagent preparation unit for preparing a reagent employed in sample measurement by diluting a high-concentration reagent with a dilution liquid; a data processing part; and a measurement unit connected to said reagent preparation unit and for measuring a sample with said reagent prepared by said reagent preparation unit, wherein said reagent preparation unit includes a state detection unit detecting at least one of a state of said reagent preparation unit and a state of reagent preparation by said reagent preparation unit and a transmission unit for transmitting state information detected by said state detection unit to said data processing part arranged outside said reagent preparation unit, said data processing part is configured to receive said state information transmitted by said transmission unit of said reagent preparation unit, includes a display, and is configured to display received said state information on said display, characterized in that: said data processing part is configured to display an instruction receiving screen (320, 321, 322) for receiving, from a user, an operation instruction to said reagent preparation unit on said display, and transmit operation instruction information based on received said operation instruction to said reagent preparation unit when said operation instruction is received by said instruction receiving screen, and said reagent preparation unit is configured to receive said operation instruction information transmitted by said data processing part, and control an operation of said reagent preparation unit in accordance with received said operation instruction information. a reagent preparation unit for preparing a reagent employed in sample measurement by diluting a high-concentration reagent with a dilution liquid; a data processing part; and a measurement unit connected to said reagent preparation unit and for measuring a sample with said reagent prepared by said reagent preparation unit, wherein said reagent preparation unit includes a state detection unit detecting at least one of a state of said reagent preparation unit and a state of reagent preparation by said reagent preparation unit and a transmission unit for transmitting state information detected by said state detection unit to said data processing part arranged outside said reagent preparation unit, said data processing part is configured to receive said state information transmitted by said transmission unit of said reagent preparation unit, includes a display, and is configured to display received said state information on said display, characterized in that: said data processing part is configured to display an instruction receiving screen (320, 321, 322) for receiving, from a user, an operation instruction to said reagent preparation unit on said display, and transmit operation instruction information based on received said operation instruction to said reagent preparation unit when said operation instruction is received by said instruction receiving screen, and said reagent preparation unit is configured to receive said operation instruction information transmitted by said data processing part, and control an operation of said reagent preparation unit in accordance with received said operation instruction information.