A method for measuring the strength and variation of nutritive qi, comprising heating tissue to a set temperature on a human meridian travel pathway, and then measuring infrared radiation to calculate an infrared shielding ratio, so that a numerical characterization of the strength of nutritive qi can be obtained. A nutritive qi measurement system, comprising at least two pairs of infrared temperature sensors and contact temperature sensors, a CPU, and a storage device, wherein the contact temperature sensor is in direct contact with the human body, and the infrared temperature sensors and the contact temperature sensors can measure the temperature of a same part in pairs. A method for measuring the strength of defensive qi, comprising attaching a medium to be heated, which is coated with a thermally insulating layer, onto a human meridian travel part, recording a temperature rising curve of the medium, and then calculating a temperature rising rate of the medium so as to estimate the strength of defensive qi at the corresponding part. A system for measuring the strength of defensive qi, comprising a CPU, a storage device, at least two media that allow contact by the human body and can be heated, and corresponding temperature sensors, wherein the CPU records a temperature rising curve of a medium to be heated and calculates a temperature rising rate so as to estimate the strength of defensive qi at a corresponding part. By means of measurement, whether a user has blood stasis or phlegm retention can be inferred. In addition, a fluctuation condition of nutritive qi and the relative strength of nutritive qi/defensive qi of different meridians can further provide auxiliary bases for syndrome differentiation of six meridians.
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