  A Compact laser plasma accelerator (CLAPA) is being built in Peking
University, which is based on RPA-PSA mechanism or other acceleration
mechanisms. According to the beam parameters from preparatory experiments and
theoretical simulations, the beam line is preliminarily designed. The beam line
is mainly constituted by common transport elements to deliver proton beam with
the energy of 1~50MeV, energy spread of 0~1% and current of 0~108 proton per
pulse to satisfy the requirement of different experiments. The simulation
result of 15MeV proton beam with an energy spread of 1%, current of 1x108
proton per pulse and final spot radius of 9mm is presented in this paper.
