A theoretical model of high power and high efficiency picosecond laser oscillator pumped by 888nm LD was fabricated. Based on simulation calculation, resonance theory, ABCD law, self-consistent condition and continuous passive mode locking condition, absorption property of crystal Nd: YVO4 at 888nm wavelength, appropriate element parameters and mode parameters, and mode locking parameters were analyzed and calculated. Parameters of a model of picosecond laser oscillator were obtained based on the above calculated results. The results indicate ...