In this work, a two-laser-tracker system was developed, and its measuring and data processing methods were designed to precisely transmit coordinates in a limited space.First, two Leica AT402 laser trackers were modified, and two target seats were respectively installed on their handles to place spherical prisms. Thereafter, the height difference between the adapter center and instrument center was precisely calibrated as vertical eccentricity. Furthermore, the two laser trackers set up survey stations and aimed at the sphere prism on the handle of the other instrument. The observed values should be adjusted to the instrument centers considering the vertical eccentricity to obtain the aiming interaction observation between the instrument centers. Moreover, the two instruments measured the target points in the visible range. When the two laser trackers could observe sufficient common points, the common points and the aiming interaction observation could be used to transmit coordinates and orientation simultaneously. When there was no common point, the aiming interaction observation was utilized to transmit the coordinates and orientation. Measurement experiments were carried out in the engineering control network of the Shanghai Synchrotron Radiation Facility. The experimental results show that when there are enough sufficientpoints in adjacent stations, the accuracy of coordinate transmission can be improved using the aiming interaction observation. When there is no common point, at 9 m, the precision of transmitted coordinate accuracy is better than 0.22 mm, and the precision of the directional rotation angle is approximately 1″. This system can be applied to the measurement of a three-dimensional control network, and is especially suitable for precise coordinate transmission inpoor visibility conditions.