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Compact energy recover linear(ERL) accelerator is a prototype of the 5 GeV ERL accelerator at KEK. The injector system has two SRF cavities which have the frequency of 1.3 GHz. It accelerates the bunches to the energy of 5 MeV. This beam was injected to the main ring and then it was accelerated to energy of 35 MeV at the main superconducting RF linac. Due to the low beam energy on the main ring, the investigation of the effect of space charge (SC) which causes the growth of the energy spread is important to produce the low emittance beam. For the production of the low emittance beam, the optimization of the merger was performed. To obtain smaller emittance at the exit of merger, the effect of the energy spread was also investigated by changing of the kd which is defined by the ratio of energy spread to length of the bunch. In this calculation, we got the noralized transverse emittance of 0.74 mm-mrad at the exit of merger section. The effect of the SC was estimated on the main SRF section, arc section and deceleration section. From the results of the study of SC effect in the c-ERL, it is shown that the optics distortion due to the SC needs to be corrected.
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