Objective The objective of study is to analyze the contents of different phytohormones at different developmental stages of a dwarf-multi-tiller rice mutant and its wild-type, and also compare the changes of morphological traits when treated by different plant growth substances. [Method] A T-DNA inserted dwarf-multi-tiller rice mutant (designed CA648) and its wild-type Zhonghua 11 (designed ZH11) were used as materials. HPLC was employed to analyze GA1, GA4, IAA, Z and ABA levels at different developmental stages (3rd leaf, 5th leaf, mid-tiller...