Relevant organizations of statistics, China's relay industry is the huge market potential. In 2008, the national industrial relay market capacity is about 1.09 billion yuan, in 2009 industrial relay market capacity up to 1.16 billion yuan, relay output of more than 3800 dollars, 2010, our country relay sales of about 1.6 billion dollars. With the top ten industrial revitalization of the policy of gradually implement, experts predict that "1025" period, relay should be dosage and application fields will continue to develop and grow, the traditional electromechanical relay will be about 8% of the growth, the development speed of the solid state relay will remain at 15% or so, special relay will with more than 20% of the speed rapid development