The solid-state dye laser exhibits attractive features such as free from pollution, compact in structure and low-cost, the development of tunable solid-state dye lasers is an area of active research. PMMA is a popular host for solid-state dyes. When ethanol was added to PMMA, the host can have some improved properties. In the present paper,research results or the transmission spectra, laser spectra, fluorescence spectra and slope efficiency of the polymer dye lasers are presented. When ethanol concentration is 15%, the polymer has the highest transmission rate in 600—750 nm region. Ethanol has a slight impact on the fluorescence spectra. The bandwidth of laser spectra, of whicl the peak positions shift with the ethanol concentration, is about 7—9 nm FWHM. The relation of output energy versus input energy was also studied, and the experimental results confirmed the theoretical results. The highest slope efficiency attained in the experiment was 49.7% with the ethanol concentration of 15%.