This is a three-dimensional spatial passive infrared detector, by a two-element passive infrared sensor with advanced control and processing circuit technology to optimize the signal detected by the sensor. It has very low leakage alarm and false alarm, and adopts bidirectional temperature compensation technology to complete intrusion motion detection in a wide temperature range. Also adopted a unique pet weight, size calculation method, pet protection level up to 25 kg. In addition, the thermal airflow resistance, curtain swing and other false moving objects also have good performance, its performance and stability far beyond the market at the same price of infrared detectors. At the same time, the detector also provides the installation user with NO/NC output selection mode, which can be directly used to activate THE CCTV system and access control system. The detector can be used in a variety of indoor situations, such as warehouses, hotel rooms, offices, etc.