Multi-camera trajectory triangulation is proposed to determine a point target trajectory in different conditions of time information. The target trajectory is parameterized by time polynomial. The motion parameters can be determined by triangulating the series of sight rays of multi-camera and the target trajectory where the object space collinearity error is minimized. In contrast with the traditional triangulation, this method can not only get higher precision, but also adapt to the conditions of asynchrony, no time registration or even no time information among multi-camera. In contrast with the monocular system, there is no request of camera motion. Synthesized and real data experiments show the validity and high precision of the proposed method.