Abstract: In this program system,the interior geometrical relationship of central projection and the abundance of observations are adequately ultilized so that its ability to detect primary data errors has been enhanced.Based on the fundamental principle of stereo-model coordinate transformation,unified formulas are used to transform the photogrammetric coordinate systems,to join the airstrips and to form the error equations of coordinate transformation of the independent models.Based on the principle of block adjustment by the use of independent models,the feature of band sparse symmetric positive definite matrix in solving large normal equations and the advantages of FORTRAN language,the lines of the computer program and the times of iteration for repeated adjustments have been greatly reduced in this program system.This program system is divided into 6 blocks.Recently it has been performed successfully on various computers such as Z-80,PDP 11/23,PERKIN ELMER OS/32,M一150,VICTOR 9000,VAX-11/750,68000 etc.