You can take the subway from Maigao Bridge to the railway station, and then take the 159 road from the railway station to Nanjing High-tech Development Zone.
Or take Yuge Line from Maigao Bridge to Getang, and then take Liuzhong Line from Getang to Nanjing High-tech Development Zone.
It is suggested to take 159 road to Nanjing High-tech Development Zone. 159 road passes through several stops in high-tech development zone. No.28 Xinke No.2 Road (Nanjing Huaruichuan Technology Co., Ltd.) which station is near, you can get on the bus and ask.
159 station:
Nanjing Long-distance East Station, Xinzhuang, Huamu Company, Nanjing Railway Station, Central Gate, Jinqiao Market, Hecheng Village, Minsheng Street, Jinhai Market, Changjiang Hotel, (Huilong Bridge), Nanqiaotou Fort, Beiqiaotou, (Da Qiao North Road), Nanjing Decoration City, Red Sun Decoration City, Taishan New Village, Taoyuan, Jinling Automobile Repair Factory, Torch Road, Keyuan Hotel, Science and Technology Entrepreneurship.