Thread joint has serveral advantages such as simple structure, convenient dismounting,various format,reliable joint,good interchangeability,therefore it is widely applied in machinery and engineering equipments.The cause and the anti loosening method of thread joint is researched,And several new anti-Loosening methods of thread are introduced.At the same time,some transverse vibration testing are implemented on a group of thread joints according to the national standard.The result of the test proves the anti loosening effect of several thread joint, and provides some reference for thread selecting in structure design field.