A flexible scheme for all-optical packet header and payload separating using two SOAbased Mach-Zehnder interferometers(SOA-MZIs),one for header extraction and the other for payload extraction was proposed. In addition,the scheme,by changing configuration,was applicable for processing optical packets of different lengths and bit-rates. Through numerical simulations,an intensity contrast ratio of more than 16dB for both header and payload at 50Gb/s can be achieved.