Shanghai South Railway Station - Chuansha

Ho do I get from the South Railway Station (or somewhere close to East China University of Science and Technology) to Chuansha by bus? The subway makes me go so far North Before i can go to Chuancha. It takes about 1h 40 min to get there, but I know it doesn't take that amount of time to get there by taxi, so it have to be a faster way to get there by bus? Right? Please, help!