The invention discloses an array processor, which comprises a plurality of functional units and at least one fault detecting unit, wherein each functional unit is formed by connecting a computing unit and a communication unit; a network is formed by connecting the functional units; and the fault detecting unit is connected with an adjacent functional unit and is used for detecting the fault of the functional unit. In the invention, a plurality of fault detecting units are added to the array processor and are connected with one another to form a detecting network; and each fault detecting unit is used for detecting the functional units in a peripheral region, so the function of fault detection of the overall array processor chip is realized in normal working.