A gas analyzing apparatus, comprising: a sampling device, comprising: a multi-capillary column consisting of a plurality of capillary columns and having an inlet end and an outlet end, and a temperature controlling system configured to couple with the multi-capillary column so as to control a temperature within the multi-capillary column; and an ion mobility spectrum analysis device adapted for analyzing a gas leaded-in by the sampling device and comprising a reaction cavity for gas reaction between sample molecules and reaction ions, the reaction cavity having a sampling opening for leading-in of the gas; wherein, the outlet end of the multi-capillary column is inserted directly into the reaction cavity of the ion mobility spectrum analysis device through the sampling opening of the ion mobility spectrum analysis device; characterised in that, the sampling device further comprises a metallic sleeve configured to enclose and protect the multi-capillary column, wherein a length of the metallic sleeve for the multi-capillary column is configured so that the metallic sleeve does not extend into the sampling opening of the ion mobility spectrum analysis device when the multi-capillary column is inserted into the reaction cavity of the ion mobility spectrum analysis device; the temperature controlling system further comprises a thermal conductor casing configured to be in a direct contact with the metallic sleeve by which the multi-capillary column is enclosed; and the thermal conductor casing comprises a plurality of protrusions on an outer circumference of the thermal conductor casing, the plurality of protrusions being configured to define spaces there among in which fluid passages are arranged or through which a fluid passes. a sampling device, comprising: a multi-capillary column consisting of a plurality of capillary columns and having an inlet end and an outlet end, and a temperature controlling system configured to couple with the multi-capillary column so as to control a temperature within the multi-capillary column; and an ion mobility spectrum analysis device adapted for analyzing a gas leaded-in by the sampling device and comprising a reaction cavity for gas reaction between sample molecules and reaction ions, the reaction cavity having a sampling opening for leading-in of the gas; wherein, the outlet end of the multi-capillary column is inserted directly into the reaction cavity of the ion mobility spectrum analysis device through the sampling opening of the ion mobility spectrum analysis device; characterised in that, the sampling device further comprises a metallic sleeve configured to enclose and protect the multi-capillary column, wherein a length of the metallic sleeve for the multi-capillary column is configured so that the metallic sleeve does not extend into the sampling opening of the ion mobility spectrum analysis device when the multi-capillary column is inserted into the reaction cavity of the ion mobility spectrum analysis device; the temperature controlling system further comprises a thermal conductor casing configured to be in a direct contact with the metallic sleeve by which the multi-capillary column is enclosed; and the thermal conductor casing comprises a plurality of protrusions on an outer circumference of the thermal conductor casing, the plurality of protrusions being configured to define spaces there among in which fluid passages are arranged or through which a fluid passes.