The present invention discloses a method and a system of obtaining a human posture, comprising: transmitting, by one or more first type electromagnetic field radiators installed on a human torso, one or more electromagnetic signals to a processor, and transmitting, by one or more second type electromagnetic field radiators installed on human limbs, one or more electromagnetic signals to the processor; measuring differences of voltage amplitudes of received signals of the first type electromagnetic field radiators relative to an electromagnetic field radiator disposed at origin of a reference coordinate, and calculating coordinate information of the first type electromagnetic field radiators relative to the origin; acquiring motion trajectories of the second type electromagnetic field radiators based on relations of distances and angles between the second type electromagnetic field radiators and first type electromagnetic field radiators, and further acquiring coordinate information of the second type electromagnetic field radiators relative to the origin by calculating coordinate changes based on the motion trajectories; and acquiring real-time information of a human posture based on real-time coordinate information of the first type electromagnetic field radiators relative to the origin and real-time coordinate information of the second type electromagnetic field radiators relative to the origin. The present invention has the technical effects of convenience, fast response, low cost and only one calibration.