Diaper having a wetness detector, system thereof and wetness detecting method

A diaper having wetness detectors, comprising:

• an inner layer, disposed at an excretory organ of an animal;
• an outer layer;
• an absorption layer, sandwiched between the inner layer and the outer layer;
• and
• a detection layer, sandwiched between the inner layer and the outer layer and comprising a plurality of conductive wire sets forming a plurality of contacts, each of the conductive wire sets having a first conductive wire and a second conductive wire, the first conductive wire and the second conductive wire of the same conductive wire set being electrically connected;
• wherein the first conductive wire has a first endpoint, the second conductive wire has a second endpoint, each two adjacent first endpoint and second endpoint of the different conductive wire sets form one of the contacts, the contacts disposed around a first area of the detection layer corresponded to a second area of the inner layer for contacting the excretory organ.