An athermal arrayed-waveguide grating (AWG) multiplexer relying on an all-polymer approach was designed fabricated by simple direct Ultraviolet photolithography process. By properly adjusting the positive coefficient ofthermal expansion of the polymer substrate and the negative thermo-optic coefficient of the polymer waveguide, athermal and polarisationindependent AWG devices are demonstrated. The new technique will be well suited for fabricating optical integrated circuits (OICS).