There is direct connection between undulation in intonation and diversification in basic tone frequency, especially in those non-tone languages like Mongolian, the diversified modes in undulating intonation of which is decided by the diversification of basic tone frequency. Through analysis of sentence pitch range and tone group range with its undulating scale in declarative sentences in standard Mongolian, conclusion can be summarized as follow: tone group range of sentence pitch range in the end of declarative sentence is much less than that one at the beginning or in the middle; while the situation is similar between the tone group ranges at the beginning and in the middle. The Q-value of declarative sentences in the upper, middle and lower lines are positive, which shows the gradual downtrend. As similar to Chinese and Japanese, the pitch downdip takes the mainstream in declarative sentences, with huge degree of downdip, while the case for updip is less seen and restricted.%语调的高低升降与基频变化有直接的关系，特别是在蒙古语等非声调语言中，从基频的变化可以确定语调高低升降变化的不同模式。通过对蒙古语标准语陈述句语句调域和调群调域及其起伏度分析，可以得出如下结论：陈述句句未调群的调域明显小于句首和句中调群，而句首调群和句中调群的调域相差不大：陈述句的Q值上、中、下线都是正值，即有逐渐下降趋势，与汉语、日语等语言相仿，陈述语句中音高下倾占主流，下降的程度可以很大，而音高上升情况很少，并受到制约。
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