Standing surface acoustic wave (SSAW) technology combined with microtechnology opens up new areas for the development of advanced microparticle and cell separating microfluidic system. A novel SSAW sensor made of the orthotropic piezoelectric composite material (OPCM) is proposed and described. A SSAW field with target wavelength can be generated by this technology and with this new sensor. The wavelength of SSAW generated by this sensor can vary the range from several to a few hundred micrometers. The acoustic radiation force (ARF) generated by the SSAW field can be used to manipulate different dimensional particles.