The invention provides a speech synthesis method and a speech synthesis system. The method comprises: receiving a text input by a user; performing text analysis to obtain a syllable sequence corresponding to the text and the syllable name of each syllable in the syllable sequence; for each syllable in the syllable sequence, planning and acquiring a corresponding duration parameter and a corresponding basic frequency parameter by combining a statistic parameter model according to the syllable name and context; for each syllable in the syllable sequence, acquiring corresponding spectrum parameter by matching from a spectrum parameter database according to the syllable name, the context, the duration parameter and the basic frequency parameter; and acquiring speech data corresponding to the syllable sequence by using a synthesizer according to the duration parameter, duration parameter, basic frequency parameter and spectrum parameter of each syllable in the syllable sequence. The method and the system can be used in embedded equipment and effectively reduce data storage space occupation while achieving a high tone quality.