GIANT Interactive has invested in a Beijing-based mobile game developer as the online game giant aims to diversify into the booming mobile game sector at a time when its traditional online game revenue is slowing.

The investment in Dijiang Network is Shanghai-based Giant's first in the mobile game industry. Giant declined to reveal details.

In the first quarter, Giant saw a 9 percent annual growth in net profit compared with above 30 percent average several years ago.