Abstract: A signal detection method for a communication apparatus and a signal detection system are provided. The signal detection method is suitable for controlling a test apparatus through an electronic apparatus to run a test on the communication apparatus. In the signal detection method, a designated test apparatus option corresponding to a designated test apparatus is selected from plural test apparatus options. A designated communication protocol is selected from plural wireless communication protocols. A test request is generated according to a model of the designated test apparatus and the designated communication protocol. The test request is transmitted to the designated test apparatus, so that the designated test apparatus performs an initialization process. The designated test apparatus is controlled to perform a signal detection process on the communication apparatus, so that the designated test apparatus generates a detection result.