Abstract: From the opinion of this article,the way to understand the climatic variation is by large scale physical effects in the solar terrestrial space,and it is also the key to forecasting problems of complex systems.Three large scale geomagnetic rules are suggested by diagrams:(1) the crab paws law;(2) the magic bottle law;(3) the soft gear law,with which the mechanism of the long term geophysical effects on Earths stroms is discussed then.