In this paper, we d iScUSS the affection of the selected reference plane on mode-locking equation when it was derived from self-consistent model and found the ideal position of reference plane. Based on these disscussion, we have developed a new mode-looking equation for Simutoneously pumped mode-looked (SPML), passive mode-locked and hybridly mode-locked dye laser. The numerical solution, of SPML was presented.