以简支平板为例，通过声辐射模态建立了弹性结构声辐射的有源主动控制策略。并分析了声辐射模态的数学和物理意义。研究发现在中、低频时，声辐射模态对应的辐射效率随着模态阶数的增加而迅速降低。在此基础上，本文提出了一种新的控制策略，即抵消前ｋ阶声辐射模态的伴随系数，使得前ｋ阶声辐射模态的声功率为零。本文以点力作动器作为控制力源进行了数值计算研究。 Taking the simple plate as an example, an active active control strategy of acoustic radiation of elastic structure is established by sound radiation mode. The mathematical and physical meanings of acoustic radiation modes are also analyzed. It is found that the radiation efficiency corresponding to acoustic radiation modes decreases rapidly with the increase of modal order at medium and low frequencies. On this basis, a new control strategy is proposed in this paper, which is to offset the concomitant coefficient of the first k-th acoustic radiation mode so that the acoustic power of the first k-th acoustic radiation mode is zero. In this paper, the point force actuator as a control force source for numerical study.