A tissue mimicking phantom is disclosed, in which the tissue-mimicking phantom comprises: at least an upper gelatin layer, each configured with at least a sunken area; at least a lower gelatin layer, each disposed beneath the at least one upper gelatin layer while being configured with at least a microchannel network having blood-mimicking fluid flowing therein; and at least a micro-heater. By the use of the sunken area of the at least one upper gelatin layer to simulate shapes and depths of different trauma wounds, the healing of anyone of the trauma wounds can be accessed clinically through a physical properties test while subjecting the trauma wound under different negative pressures and different dressings.