> in this link, there are a lot of title, but there is no solution.

That's right.  Take it as meaning that what you are asking for is not
easy to achieve.

> city mean is important points. i said an example up.
> city is a point which we use same road to get there.

Which leads to the question ... "what is an important point?"  You,
me, and Google may all have different ideas about what is important.
Point means a point, you might like to think about how close your
route needs to get to that point to be counted.  Cities are not
points, they are sprawling irregular areas.

Half the battle with what you are trying to do will be to define what
you really want, clearly.   That might then need to be modified in the
light of what you can actually do !

> in this link, i don't understand that how can i read the returned
> polyline?

See the documentation
http://code.google.com/apis/maps/documentation/javascript/v2/services.html#ReturningDirections

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