The SGTC(spark gap tesla coil) invented by Nikola Tesla is widely known under the research of wireless electric energy transmission. Although the structure of the coil is easy, but it works under large voltage and large current, which are danger to the users. The frequency tracking SSTC(solid state Tesla coil) and fixed frequency SSTC are designed in this paper, which can achieve wireless electric energy transmission and ensure the safty of the users at the same time. It is proved by experiments that the three circuits will not produce unsafe voltage and current, no matter it is under regular work or not. The frequency tracking SSTC can light the energy saving lamp under the power of 9 V battery, the fixed frequency SSTC can achieve secondary coil discharge under the power of 12 V DC.