A coronary artery load detecting method comprises: acquiring the cross sectional area of a reference cavity, and separately acquiring voltage values of a main device at a position corresponding to the cross sectional area of the reference cavity in a low frequency state and a high frequency state (S1) separately acquiring voltage values of the main device at positions of the bottom end or top end of a to-be-tested object in the low frequency state and the high frequency state under the same current (S2) driving the main device to move at uniform speed, and acquiring the voltage value of the main device in the movement process under the same current and under the low frequency state (S3) and acquiring the cross sectional areas of the positions of the to-be-tested object according to a preset fixed current value, the cross sectional area of the cavity and the acquired voltage values. Also disclosed is a coronary artery load detecting system. In the system and the method, the voltage values of the positions of the to-be-tested object are acquired by means of a frequency conversion manner, and further, the cross sectional areas of the positions of the to-be-tested object are obtained by means of parsing and parameters comprising plaque parameters and an FFR of the positions of the to-be-tested object are acquired according to the cross sectional areas, operations are simplified, and cost is reduced.Linvention concerne un procédé de détection de charge dartère coronaire comprenant : lacquisition de la section transversale dune cavité de référence, et séparément, lacquisition de valeurs de tension dun dispositif principal au niveau dune position correspondant à la section transversale de la cavité de référence dans un état basse fréquence et dans un état haute fréquence (S1) séparément, lacquisition de valeurs de tension du dispositif principal au niveau de positions de lextrémité inférieure ou de lextrémité supérieure dun objet à tester dans létat basse fréquence et dans
