Location: Map
Getting there: From Anning, take buses #3, then #80 (route). From the city centre, take buses #26 or #127 (which departs from the train station, route)
Cost: Entrance to the park is free. There is a ticket office where you can buy books of tickets for the rides, or you can pay at the rides individually (Y5-30)
More on Lanzhou's parks here and here.