Actually, the if you would like to take a subway from the airport to Yehui Road, it is very complicated. For an easier one, it is suggested that you take the airport shuttle bus Line 7 to get to Shanghai South Railway Station firstly. Here, you could take the subway Line 3 to Yishan Road fistly and then please transfer to Line 9 right here. Then, please get off at Sheshan Station. Exit from the subway station, you have to hire a cab driving you to the Yehui Lu. The taxi fare should be within 20RMB.