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Given is an analysis of broad-band Er-doped superfluorescent fiber source(EDSFS) filter using long period chirped fiber grating by transmission matrix method. For our EDSFS attenuated amplitude demand and the flattened wavelength range demand, proposed are the key factors of designing such filters of high performances. The simulation result demonstrates that such type filters have an enough attenuation to flatten the dramatic increase in output amplified spontaneous emission(ASE) in the wavelength range of 1 529 nm～1 535 nm by choosing conformable fiber filter parameters such as chirped degree, original period, induced index change, length of the fiber filter, and then broad-band EDSFS could be achieved.