This article summarized the latest research production of occurrence theories,estimation and elimination methods about exercise fatigue.

Characteristics and elimination methods of passive vibration;

The interference of line strain observation in Huailai Seismic Station and elimination method;

The analysis narrated the stray currents production and the distribution,had pointed out explicitly the stray currents to the coal mine production hazardous nature,finally introduced the stray currents elimination method,guarantees the coal mine safety production.

Mixing inefficient zone of concrete mixer and its eliminating methods;

The damnification and eliminating methods of surge for semiconductor lasers;

This paper analyses error of gnashing teeth in the course of inside gear producing,and puts forward the eliminating methods.

Objective Two types of skin sterilization method used in 120 patients who were retaining central vein cannulas were compared,to find a sterilization method which can decrease the infection rate of central vein cannulation.