For laser range-finders to measure target′s distance accurately and creditably it is important that three-optic-axes are accurately adjusted to be parallel to each other with eccentric object-glass-frame and rings. Because the exercises of optic-axes-adjustment cannot be done with real laser range-finders

the formulate used to imitate real optic-axes-adjustemnt are worked out by using an example in which the object-glass of laser range-finger has an eccentric object-glass-frame and ring to adjust aiming and laser-shooting axes to parallel. First

it is proved that the error of optic-axes-parallelism can be measured with a collimator and a black-photograph. Second

the formulae are given

which are used to calculate the radial displacement of an object-glass' principal point

when aiming and laser-shooting axes are accurately adjusted to parallel with the known error of optic-axes-parallelism and focal distance of object-glass. Finally

knowing the error of optic-axes-parallelism and thinnest-position of eccentric object-glass-frame and ring before optic-axes-adjustment

the formulae are analyzed to give the new thinnest-position of eccentric object-glass-frame and ring for accurately adjusting optic-axes to parallel each other. According to the real handling of optic-axes-adjustment

the principle point of object-glass is moved by rotating eccentric object-glass-frame and ring.