In order to monitor mine derrick deformation,an ambiguity search algorithm with baseline constraint was presented,and attitude determination of kinematical carrier was described based on the Rodrigues matrix.Finally,the rationality of the model was verified by project cases,and the result shows that the ambiguity search algorithm with baseline constraint is superior to the LAMBDA and MLAMBDA methods,and the ambiguity can be fixed with 7 epoch observations for 1 second sampling rate; The dynamic positioning accuracy of high-frequency GPS can reach up to millimeter level,and the corresponding precision of attitude information can be achieved 0.2 degree when the length of baseline is about 2 m; the method can provide accurate information for derrick stress analysis and failure evaluation.