Electron transport through a mesoscopic dual rings with a stub is investigated by using quantum waveguide theory. In the case of ensuring the continuity of the wavefunction and the closing of the current, the analytic expression of the transmission coefficient is derived and the transmission properties are analysed. The results show that the transmission coefficient of electron in dual mesoscopic rings with a stub oscillates with the changing of the length of the stub, the length of the any ring, the position of the stub and the interval between the two ring. The transmission coefficient of the electron can be modulated up to 100% by modulating any parameter of the above.