We report the generation of high-order Stokes and anti-Stokes picosecond laser light by using an YVO4 Raman seed-amplifier system. This system can eliminate filametation induced by nonlinear effect. The two key elements for the system are seed-pump time synchronization and the incident angle between Raman seed and pump, which are studied in details. The result proves that Raman seed-amplifier system is a simple and practical way to get multi-wavelength picosecond lasers.