MikroTik

i have two adsl lines from same isp
i made the two speedtouch modems in bridge mode..
the modems connected to a switch.
i made two pppoe client interfaces with the two accounts in MT.
the problem now the two pppoe client interfaces can't work together.
how can i route pppoe1 to use speedtouch1
and pppoe2 to use speedtouch2

st1 (bridge mode)

isp>>>>> switch>>>BULLET2HP MT(3.20)TWO PPPOE CLIENT

st2(bridge mode)

If you have two ADSL routers connected to a switch that means that you are have both your PPPOE clients on the same ethernet interface right?

How is your network set up?

If I had the same setup like you, my network topoligy would have looked something like this:

2 x ADSL routers -> Switch -> Connected to first Ethernet Port on Mikrotik Router -> Second Ethernet Port on Mikrotik router connected to my internal network.

How does your setup look?

Does your pppoe works? The problem is pppoe or routing?

Not entirely clear about your post.
You didn't specify what RB you're trying to use. I will assume it has more than one ether interface.
Are you creating a simple failover or are you using the links for load balancing?
Either way, I think this will point you in the right direction: http://wiki.mikrotik.com/wiki/User/Routing
Not sure what the switch is for, but if Your RB has just one ether interface I suggest you archive it for some other use and get one than that has at least 3 ether interfaces.
I don't think it would be tidy or even permissible creating a virtual LAN for the 2nd wan/pppoe client interface if your RB has just one ether interface.
Also, you should title your post appropriately rather than generically: "help me" is less attractive than say "problem with dual pppoe client on RBxxx".

Your description isn't the clearest but from what I can work out you have two bridged modems connected to a switch... Bridged in networking terms meaning no routing, just a conversion of mediums from ADSL to Ethernet

Never do that, seriously. It could cause all kinds of problems the least of which could get the port blocked to prevent loops. It depends on the provider setup of course. That's the kind of things network engineers either laugh at or groan if they see. If they're routed then it's a different story as long as they're configured correctly.

The router should be the device that the two internet connections are brought into on separate ports. As it is now from my understanding of what you described you're never going to use both modems until you fix it because the bullet is only going to pull one address from DHCP and it's a tossup as to which connection it receives the reply from first, if the upstream device hasn't blocked traffic on one of the ports already.