A spectrum testing scheme of optical passive device based on LabVIEW was proposed. Relying on LabVIEW programming control over tunable laser, programmable optical filter, optical power meter and data acquisition (DAQ) platform, spectrum characteristics of various transfer functions could be obtained. When laser sweeping speed was 10 nm/s, sweeping range was 10 nm, and DAQ sampling rate was 1 MS/s, spectrum measurement for one device could be finished in 1 s, with spectrum resolution of 1 pm. Compared with conventional spectrum testing method utilizing broadband light source and Optical Spectrum Analyzer (OSA), the performance test scheme could achieve the traditional scheme level, and got more delicate spectrum details. The experimental results show that the proposed scheme can be applied for spectrum measurement with the demand of high resolution, fast speed and high efficiency.