A biological detection system (10, 10a, 10b), comprising: a control module; a bearing rotatable plate, having a main rotating shaft; a first driving module, electrically connected to the control module and connected to the main rotating shaft, and adapted for the bearing rotatable plate to rotate about the main rotating shaft; a plurality of rotatable sub-plates, each having a respective independent rotating shaft different from the main rotating shaft, wherein the rotatable sub-plates are disposed on the bearing rotatable plate and each is independently rotatable about the respective independent rotating shaft; a plurality of second driving modules, electrically connected to the control module, so that each of the rotatable sub-plates independently rotates about the respective independent rotating shaft; and a plurality of test cassettes, detachably disposed on the rotatable sub-plates, wherein the each of the test cassettes comprises a micro-channel structure adapted to be disposed with a fluid set, wherein: the bearing rotatable plate is driven by the first driving module to rotate about the main rotating shaft, so as to provide a centrifugal force to the test cassettes on the bearing rotatable plate, and each of the rotatable sub-plates is independently driven by one of the second driving modules, so that each of the test cassettes is rotated independently about the respective independent rotating shaft, wherein the test cassettes comprise a first cassette and a second cassette different from each other, the micro-channel structures comprise a first micro-channel structure and a second micro-channel structure different from each other, the first cassette comprises the first micro-channel structure, and the second cassette comprises the second micro-channel structure, and the biological detection system (10, 10a, 10b) is configured that when the first cassette and the second cassette are respectively disposed on two of the rotatable sub-plates, the two rotatable sub-plates are driven by their corresponding second driving modules to rotate in different rotating directions, rotating speeds, or rotating angles. a control module; a bearing rotatable plate, having a main rotating shaft; a first driving module, electrically connected to the control module and connected to the main rotating shaft, and adapted for the bearing rotatable plate to rotate about the main rotating shaft; a plurality of rotatable sub-plates, each having a respective independent rotating shaft different from the main rotating shaft, wherein the rotatable sub-plates are disposed on the bearing rotatable plate and each is independently rotatable about the respective independent rotating shaft; a plurality of second driving modules, electrically connected to the control module, so that each of the rotatable sub-plates independently rotates about the respective independent rotating shaft; and a plurality of test cassettes, detachably disposed on the rotatable sub-plates, wherein the each of the test cassettes comprises a micro-channel structure adapted to be disposed with a fluid set, wherein: the bearing rotatable plate is driven by the first driving module to rotate about the main rotating shaft, so as to provide a centrifugal force to the test cassettes on the bearing rotatable plate, and each of the rotatable sub-plates is independently driven by one of the second driving modules, so that each of the test cassettes is rotated independently about the respective independent rotating shaft, wherein the test cassettes comprise a first cassette and a second cassette different from each other, the micro-channel structures comprise a first micro-channel structure and a second micro-channel structure different from each other, the first cassette comprises the first micro-channel structure, and the second cassette comprises the second micro-channel structure, and the biological detection system (10, 10a, 10b) is configured that when the first cassette and the second cassette are respectively disposed on two of the rotatable sub-plates, the two rotatable sub-plates are driven by their corresponding second driving modules to rotate in different rotating directions, rotating speeds, or rotating angles. the bearing rotatable plate is driven by the first driving module to rotate about the main rotating shaft, so as to provide a centrifugal force to the test cassettes on the bearing rotatable plate, and each of the rotatable sub-plates is independently driven by one of the second driving modules, so that each of the test cassettes is rotated independently about the respective independent rotating shaft, wherein the test cassettes comprise a first cassette and a second cassette different from each other, the micro-channel structures comprise a first micro-channel structure and a second micro-channel structure different from each other, the first cassette comprises the first micro-channel structure, and the second cassette comprises the second micro-channel structure, and the biological detection system (10, 10a, 10b) is configured that when the first cassette and the second cassette are respectively disposed on two of the rotatable sub-plates, the two rotatable sub-plates are driven by their corresponding second driving modules to rotate in different rotating directions, rotating speeds, or rotating angles.