A gas-chromatography analysis system for the analysis of a test sample containing at least one analyte, comprising means for handling a carrier gas, a MEMS injector in thermal connection with one or more injector heaters and one or more injector temperature sensors, as well as at least one detector of said at least one analyte, wherein on a first side of said MEMS injector the following are fluidically connected to the MEMS injector by respective fluidic connections: - a MEMS preconcentrator, in thermal connection with one or more preconcentrator heaters and one or more preconcentrator temperature sensors; - a MEMS chromatography separation column, in thermal connection with one or more separation column heaters and one or more separation column temperature sensors; - a fluidic head mechanically interconnecting the injector, the preconcentrator and the separation column, which are mechanically independent and thermally separated, the fluidic head comprising a series of channels (171, 172, 173, 174) configured to allow the flow of the carrier gas and/or the sample to be analyzed towards the injector and from there towards the preconcentrator and/or towards the chromatography separation column and/or towards said at least one detector; wherein: - the respective fluidic connections are sealing means interposed between said MEMS injector and said MEMS preconcentrator and between said MEMS injector and said MEMS chromatography separation column; - said MEMS injector comprises a series of MEMS on-off valves (V1, V2, V3, V4, V5) positioned at respective points of said injector configured and adapted to: ∘ in a first state, make said sample to be analyzed to flow into said preconcentrator in such a way that said at least one analyte is stored therein, and at the same time make said carrier gas to flow through the separation column; ∘ in a second state, use the carrier gas to make said at least one analyte to flow from said preconcentrator to said chromatography separation column and finally to said detector; wherein on a second side of said MEMS injector, opposed to the first side, the following are provided in a successive order from the MEMS injector: - a heat-insulating material spacer; - a series of solenoid valves configured to control said series of valves (V1, V2, V3, V4, V5). - a MEMS preconcentrator, in thermal connection with one or more preconcentrator heaters and one or more preconcentrator temperature sensors; - a MEMS chromatography separation column, in thermal connection with one or more separation column heaters and one or more separation column temperature sensors; - a fluidic head mechanically interconnecting the injector, the preconcentrator and the separation column, which are mechanically independent and thermally separated, the fluidic head comprising a series of channels (171, 172, 173, 174) configured to allow the flow of the carrier gas and/or the sample to be analyzed towards the injector and from there towards the preconcentrator and/or towards the chromatography separation column and/or towards said at least one detector; - the respective fluidic connections are sealing means interposed between said MEMS injector and said MEMS preconcentrator and between said MEMS injector and said MEMS chromatography separation column; - said MEMS injector comprises a series of MEMS on-off valves (V1, V2, V3, V4, V5) positioned at respective points of said injector configured and adapted to: ∘ in a first state, make said sample to be analyzed to flow into said preconcentrator in such a way that said at least one analyte is stored therein, and at the same time make said carrier gas to flow through the separation column; ∘ in a second state, use the carrier gas to make said at least one analyte to flow from said preconcentrator to said chromatography separation column and finally to said detector; ∘ in a first state, make said sample to be analyzed to flow into said preconcentrator in such a way that said at least one analyte is stored therein, and at the same time make said carrier gas to flow through the separation column; ∘ in a second state, use the carrier gas to make said at least one analyte to flow from said preconcentrator to said chromatography separation column and finally to said detector; - a heat-insulating material spacer; - a series of solenoid valves configured to control said series of valves (V1, V2, V3, V4, V5).