Q-Learning　can　successfully　solve　the　congestion　problem　of　isolated　intersection.　But　it　is　not　available　to　realize　the　coordination　between　two　intersections.　A　switching-model　of　two　intersections　is　introduced　in　this　paper.　The　concept　of　combinative　phase　is　put　forward　in　order　to　divert　two　intersections　into　a　single　one.　In　this　way,　we　can　apply　Q-Learning　on　two　adjacent　intersections.　The　validity　and　feasibility　are　proved　by　Paramics　simulation　software.