We present existence theorem for pseudo almost periodic solutions with piecewise constant argument by means of unique decomposite character and for pseudo almost periodic sequence solutions of relevent difference equations 摘要利用伪概周期函数唯一分解性质，研究相关差分方程的伪概周期序列解，并以此为工具得出一类带逐段常变量微分方程伪概周期解的存在唯一性。
