i am planning to go nanning about 5 days, is there any attraction?

For sightseeing, the Nanhu Lake Park is a must-go. The Ocean World and People's Park also worth your time. The Chaoyang Road (Wanda Plaza Commercial Zone) is the most famous and bustling pedestrian street. I suggest you go for fun.

For the surrounding visit, Beihai and Detian Waterfall are recommended. At least one full day (or longer) is needed for each. The above are actually enough for your 5-6 days' stay. Or after visiting the city, you may wanna go to Guangzhou instead of the two I mentioned. Well, it is possible. Ride a high speed train to reach in 4h and 10min. You can spend at least two days there, with sightseeing at Haizhu Plaza, Pearl River, White Cloud Mountain, zoo, etc.