Two 49mm×49mm×3.5mm Si(Li) detectors were fabricated. The leakage current of detector Si(Li)-E-1 vs bias at different temperatures was shown. The energy resolution (FWHM) of detectors E-1 and E-2 for 238Pu 5.499MeV α-particles were ~54.47keV (18°C) and ~57.09keV (20°C) respectively.