By combining micro-machine with micro-assembly techniques, the 1×8 Optical Wavelength Selector (OWS) has been realized. The OWS based on Micro-Electro-Mechanical System (MEMS) technology is composed of electromagnetic optical switch, reflecting prisms, thin films filters and fiber collimators. The driving control circuit is designed for the 1×8 OWS. The test system of the response time and the insertion loss is designed and built for the 1×8 OWS. The response time and insertion loss of the 1×8 OWS has been measured. The final experimental results of the 1×8 OWS include the response time of about 15 ms and the insertion loss of about 2.5 dB.