【摘要】 当对监测网进行拟稳平差〔1〕时，拟稳点往往不能一次判定，而需要多次更换。更换拟稳点时，可将新选拟稳点坐标排列在最后，将其前未知量约化，然后求部分伪逆解。这样做工作量较大，因此本文利用带未知量条件的间接平差法，在更换拟稳点时，只需更换未知量条件，将条件以外大量计算保留使用；本文更进一步指出，直接利用变换矩阵将任一平差结果变换为所要平差结果，计算量将大大减少。文中涉及许多有关自由网平差的问题，也都作了较详细的讨论。更多还原

【Abstract】 :In the quasi-stable adjustment [1] of a monitoring network. stable points frequen-tly can not be ascertained at once. several alterations may be needed. When changingto new quasi-stable points, one can place their coodinates at the last, and after reduc-tion of the foregoing parameters. find the partial pseudo-inverse solution, as was presc-ribed in [1]. But generally the computation involved will be large. so that the presenpaper takes advantage of adjustment by parameters with conditions. Thus only the para-meter conditions need to be changed, while the other computations being kept in use.Still better, making use of a transformation matrix, an adjustment result can be directlychanged to the desired one, the calculation required will be further reduced.In the discussion, many problems concerning free net adjustment are treated in so-me detail.更多还原