Double novel neodymium complex liquid laser medium were prepared based on Neodymium Oxide and 1, 10Phenanthroline. This laser medium was nontoxic, low cost, and well thermo stability. When cross relaxation was considered, the rate equations of every level particle were obtained while Nd3+ “green” novel liquid laser medium was excited. The relation between Nd3+ concentration and 4F3/2 luminescence strength was researched using rate equations, while absorption spectrum and luminescence spectrum were measured. The results show that the luminescence strength increases with concentration firstly and then decreases with concentration. The relation between operation time and luminescence strength are also researched.