Several new polymers, which contain diacetylene groups in the main chains and polar chromophores in the side chains were synthesized and characterized. The polymers gave films with excellent optical quality by spin coating or casting due to their amorphous nature. The SHG measurements showed that the main chains have very important role to determine the second order nonlinear properties. For example the polymers having para benzoates chains had much higher SHG values than meta benzoate chains and pentynoic chains. Some of these polymers demonstrated very,high SHG values, and this is probably because their extremely high order parameters, which is around 0.5 - 0.6.