本文主要探討水準網動態平差模式，應用秩虧自由網平差模式之觀念，將動態平差觀測方程式視為靜態方程式，而以靜態平差方法來處理。為了減少模式中未知數的數量，將兩期觀測高程差的較差當作一新的觀測量，以點位變形參數（變形值及變形加速率）為未知數構建成較差動態平差模式。文中以台北盆地民國81年至民國85年水準網觀測資料作實例分析，研究該地區的地盤沈陷變形是否顯著。文中並討論較差動態平差一次整體處理與分階段處理之適用性與應用時機。

　　In this paper, the dynamic adjustment models for leveling networks have been discussed. Though the models proposed are dynamic physically, the conventional static approach was adopted in the treatment based on the theory of freenet adjustment with rankdeficient. In order to reduce the number of unknowns, the differences of the observed height differences at two epochs were taken and viewed as the observables while the displacements and accelerations of the vertcal deformation served as the unknown parameters. The model so molded is referred to as "The dynamic adjustment model by differencing". The leveling data of Taipei Basin observed over the period from 1992 to 1996 were analyzed for detecting its deformation. In addition,the compaisons for suitability of method were made bdtween the one-phase adjustment and the two-phase adjustment. The former involves using simult aneously all the observables of the network for forming the observation equation, where as the latter needs to adjust first a main nodal network and the adjustment of the network as a whole is subsequently run by the constrained trchnique using the results due to main nodal network as the constraints.