The invention provides a test system and a method with conformance test and performance test combined. The system comprises a network tester for testing PPS (Packets per Second) deviation in the network and a clock tester, wherein the clock tester is connected with a tested device via a network area communication device and an area communication network, and the network tester is connected with the network area communication device; the clock tester comprises a main clock chip, a transmitting unit, a response packet receiving unit and a logic judgment unit, the transmitting unit is used for transmitting a test excitation packet based on an IEEE1588 protocol to the tested device through the area communication network, the response packet receiving unit is used for receiving a response packet based on the IEEE1588 protocol returned by the tested device through the area communication network, and the logic judgment unit judges whether the tested device processes the packet logic correctly according to the response packet and judges whether the clock precision of the tested device is consistent with the test excitation packet according to the response packet and the main clock chip.