Though expanding the representation linear space of trajectory parameters calculated by the least square estimate for multi-photo-electric cinetheodolite intersection, so that the measuring error information can be expressed in this space, and then the errors of the measurements were diagnosed by simulation by using the initial trajectory. This method adopts both multi-measurement redundant and prior information of trajectory parameters to optimize the trajectory calculation, makes the trajectory calculation more accurate and complete. The artificial calculation indicates that this method can give out the diagnoses of the measure errors, and improve the accuracy and completeness of the trajectory.