Based on analyzing of bit-error performance, parameters optimization for XGM wavelength conversion in semiconductor-optical amplifiers (SOA), which was used in communication system, is presented in this paper. Segmented model for SOA, transferring matrix method (TMM) and average spontaneous emission power are exploited in the theoretical analysis. Carrier consumption due to amplified spontaneous emission is introduced in the carrier rate equation. Results show that there exist optimal values of probe power, average pump power, conversion span and length of active cavity for special condition. It is also shown that small waveguide internal loss is helpful to achieve good bit-error performance.