Abstract: Aiming at improving the PIR array's detectivity and perception, reducing the domain in detect cost, a PIR single node array was put forward to push the target trajectory. In order to simplify the structure, only four dual pyroelectric infrared sensors were used to compose a single node array. Meanwhile, when the PIR is in the stationary state, it can detect the direction of the movement and the distance from the target to the panel point. And when the PIR is in rotational state, it can detect the angle and time of the moving target. Then they can use these data to achieve the target trajectory only by a single node. After pushing a target's trajectory, it continues the detection to the target, and will get new data. Thus it can correct the trajectory step by step, which will increase the reliability of the trajectory pushing. Proved by experiment, this method breaks through the past multi-node localization and trajectory pushing. Meanwhile, instead of the previous eight PIR sensor-four dynamic four static, the author innovatively come up with the single node array just containing four PIR sensors, which greatly reduces the detect cost and has a very high practical value and reliability.