Inductance stability is an urgent problem to be solved. Because the stability of inductance coil is particularly important. The stability is the degree of the change of the inductance coil parameters with the change of environmental conditions. So how can we effectively improve the stability of the inductor coil? The first is to do a good job of inductance coil temperature coefficient. Inductance temperature coefficient is mainly due to the expansion of the coil wire after heat, so that the coil caused by the geometric distortion caused by. In order to improve the stability of the coil temperature, can use hot winding method of coil is made: wound coils of wire current, wire gets hot again around coils, this can make the cooling coil after shrinks tightly around in the skeleton, not prone to thermal deformation, accordingly to improve the stability. In addition to temperature, humidity can also cause the change of inductance coil parameters. For example, when the humidity increases, the distribution capacitance and loss of the coil increases, so that the stability of the coil is reduced. In order to prevent the influence of humidity on the parameters of the coil, in the production of inductive coils, usually have to take moisture measures, such as the use of epoxy resin encapsulation or impregnation. The stability of such a caller inductance coil is improved.