1. Some classical models of isostasy are discussed.

2. Based on isostasy principle, this paper made out a correction method for the calculation of disconformity erosion amount.

3. In addition, gravity isostasy can play a part in the subsidence.

3. try its best to gather and make good sentences.

4. A new model of isostasy is introduced corresponding to a certain rotational regime of the earth.

5. The conception of crustal isostasy produces a great effect to the geo-scientific research; especially take an important role in the studies of Geodesy and Geodynamics.

6. As the change in density is the result of a change in temperature this kind of isostatic adjustment is termed thermal isostasy.

7. But if the lithosphere along the margin has sufficient rigidity the resulting imbalance in load will be accommodated through flexural isostasy.

8. Moreover, using the regional heat flow dataset, we discussed the gravity and thermal effect in the isostasy mechanism on the present topography.

9. Using the isostatie response function technique, we have investigated the isostasy and crustal density structure of Panzhihua- Xichang region, which was supposed to contain a continental rift valley.

10. A comparison of the magnetotelluric data with gravity data shows that both gravity lows and negative isostasy gravity anomalies correspond to all the main electrical gradient zones.

11. The calculation shows that the increase of heat gradient, over the depth of isostasy, will cause the negative gravity anomaly.

12. Meanwhile, it used the economic analysis method of local isostasy to theoretically analyze the economic effect of TBT on Guizhou pharmaceutical imports and exports trades.

13. The crust in western China is in the state of isostasy.

14. This paper attempts to illus-rate the influence and significance of hypothesis to surveying science with examples of oblate Earth Theory, Isostasy Theo-y and Least -square Method.