A series of A(x)B(1-x)Fe(2)O(4) (x = 0.05-0.50) (A, B as Zn2+, Ni2+, Co2+) micro-nanospheres were prepared using a facile one-pot solvothermal method. All products are spinel structures with grain sizes of around 11-15 nm as characterised by using XRD. SEM and TEM images show that NixZn1-xFe2O4 (x = 0.05-0.50) are microspheres self-assembled by nanoparticles with an average diameter of 200-300 nm, but the sizes of NixCo1-xFeO4 (x = 0.10-0.50) and ZnxCo1-xFe2O4 (x = 0.10-0.50) micro-nanospheres increase from 20 nm to 200 nm with increasing amounts of Ni2+ and Zn2+. As-prepared A(x)B(1-x)Fe(2)O(4) samples are paramagnetic materials with coercivities of no more than 177.5 Oe. The morphologies and magnetism of A(x)B(1-x)Fe(2)O(4) could be adjusted by changing the amount of A(2+) and B2+.