  We present a superfield Lax formalism of superspace sigma model based on the
target space ${\cal G}/{\cal H}$ and show that a one-parameter family of flat
superfield connections exists if the target space ${\cal G}/{\cal H}$ is a
symmetric space. The formalism has been related to the existences of an
infinite family of local and non-local superfield conserved quantities. Few
examples have been given to illustrate the results.
