The invention relates to a microwave subsystem of high heat resistance which is used in the fore end of the weather radar receiver, it includes: superconductive filter, low noise amplifier with table structure, tiny band transmission line, sealed shell, refrigeration machine and temperature control instrument; Said superconductive filter includes high temperature superconductive shield box and superconductive piece which is in the high temperature superconductive shield box; the output end of the superconductive filter is electric connected with the low noise amplifier via tiny band transmission line, both are installed on the heat transferring plate, the bottom of the heat transferring plate is fixed to the cool head of the refrigeration machine. The advantages of the invention are realizing the flat integrating technique and making the assembly of the subsystem more reasonable, so the noise of the subsystem is decreased further; the heat resistance of the invention is high, the cool quantity wastage of the subsystem cool head is small, so under the equal refrigeration power, flat integrating technique can load more components. For example, the same refrigeration machine can load several superconductive components or other device.