A method of obtaining a human posture, comprising following steps: step 1, transmitting, by one or more first type electromagnetic field radiators installed on a human torso, one or more electromagnetic signals received from another electromagnetic field radiator to a processor, and transmitting, by one or more second type electromagnetic field radiators installed on human limbs, one or more electromagnetic signals received from another electromagnetic field radiator to the processor; step 2, measuring, by the processor, 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; step 3, acquiring, by the processor, 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 step 4, obtaining, by the processor, real-time information of the 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, wherein the relations of distances and angles between the second type electromagnetic field radiators and first type electromagnetic field radiators in step 3 are obtained according to a following step: acquiring a distance relation of the second type electromagnetic field radiators and the first type electromagnetic field radiators, and acquiring an angle relation of the second type electromagnetic field radiators and the first type electromagnetic field radiators, wherein one of the second type electromagnetic field radiators 2H transmits signals that are received by two of the first type electromagnetic field radiators 2G and 2F; signal strengths of the signals received by 2G and 2F are measured to obtain Vout2g and Vout2f; a plurality of values of r and θ are calculated based on Vout2g and Vout2f wherein r refers to a distance between 2H and 2G, and θ refers to an angle between 2H and 2G; and the plurality of values of r and θ are constrained according to preset constraints of r and θ to eventually obtain the distance relation and the angle relation of 2H and 2G. step 1, transmitting, by one or more first type electromagnetic field radiators installed on a human torso, one or more electromagnetic signals received from another electromagnetic field radiator to a processor, and transmitting, by one or more second type electromagnetic field radiators installed on human limbs, one or more electromagnetic signals received from another electromagnetic field radiator to the processor; step 2, measuring, by the processor, 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; step 3, acquiring, by the processor, 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 step 4, obtaining, by the processor, real-time information of the 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, acquiring a distance relation of the second type electromagnetic field radiators and the first type electromagnetic field radiators, and acquiring an angle relation of the second type electromagnetic field radiators and the first type electromagnetic field radiators, wherein one of the second type electromagnetic field radiators 2H transmits signals that are received by two of the first type electromagnetic field radiators 2G and 2F; signal strengths of the signals received by 2G and 2F are measured to obtain Vout2g and Vout2f; a plurality of values of r and θ are calculated based on Vout2g and Vout2f wherein r refers to a distance between 2H and 2G, and θ refers to an angle between 2H and 2G; and the plurality of values of r and θ are constrained according to preset constraints of r and θ to eventually obtain the distance relation and the angle relation of 2H and 2G.