The tectonics of Qiangtang basin lying in central Qinghai-Tibetan plateau is main of east-west folds,overthrust faults and nouth-west,northe-east transcurrent faults,and occasionally nouth-west,north-east folds and near south-north normal faults can be found.For the basin has been great compressed by south-north stress since Indosinian movement,the feature of its rock's strain displays south-north compression and east-west extension,including inheriting and increasing strain,moreover,the strain of rock trends to decrease by degrees from orogen around the basin to central basin.The south-north crust in Qiangtang basin has been shortening successively since Indosinian movement,and respectively its shortening ratios are 38% at Trias,24%~26.3% at Jurassic,17.47%~19.2% at Tertiary.