Abstract: The paper studies a new kind of beam forming system based on injection-locking technique,which has the merits of low cost,high integration and high efficiency.The article reviews the theory of transmitting beam forming system,and studies the stability of injection-locking oscillator's phase dynamics' equilibriums.According to phase noise theory of injection-locking oscillators,the design rules of injection-locking oscillators are presented.Results of theoretic analysis are used to design a new kind of beam forming system which can generate high stability,low phase noise multi-channels transmitting signals with arbitrary phase coefficients.Computer simulations are used to simulate the beam former. The simulations testify the feasibility of realizing the beam-former based on injection-locking technology.Four channels injection-locking oscillators is fabricated and testified.The testing results show that injection-locking oscillators can produce multi-channel signals with arbitrary phase coefficients.The usefulness of the beam forming system is also proved by the experiment.