A method for making a culture medium for culturing neural cells is provided. Each neural cell includes a neural cell body and at least one neurite branched from the neural cell body. The method includes the following steps. An original carbon nanotube structure is provided. The original carbon nanotube structure includes at least one drawn carbon nanotube film including a number of carbon nanotubes joined end to end by van der Waals force. The carbon nanotubes are substantially oriented along a same direction. A carbon nanotube structure including a number of carbon nanotube wires spaced from each other is formed from the original carbon nanotube structure. A distance between adjacent carbon nanotube wires is larger than or equal to a diameter of the neural cell body, the carbon nanotube wires are capable of guiding extending directions of the neurites. The carbon nanotube structure is fixed on a substrate.
