How to get from Liede to canton tower or to Chigang bei lu by bus?

You mean Liede Subway Station, right? You may take bus line 90 or 583 from Liede East Station. For the North Chigang Road (Chigang Bei Lu), get off at Chigang Station. Walk west along Middle Xingang Road for about 600 yards, and turn right. For Canton Tower, get off at Shuangta Lu Station. Next, walk north along Liede Avenue for about 900 yards, and turn left. Then, walk west along West Yuejiang Road for about 800 yards to the tower.

And yes, bus line 90 and 583 go by Liede Bridge.